Sentences with phrase «earliest living organisms»

It is thought that the earliest living organisms probably emerged in a watery soup.

Not exact matches

EVOLUTION: the process by which different kinds of living organisms are thought to have developed and diversified from earlier forms during the history of the earth.

In an earlier chapter we stressed the Christian teaching that each of us is a compound and complex organism of material stuff, and of intellectual, emotional, cognative, and valuational powers, all of which are necessary for full life in this world.

There is little doubt that disparity — that is, the range of different organism «designs» or «ways of life» — rose sharply in the early Cambrian.

May 28, 2013 — The widespread disappearance of stromatolites, the earliest visible manifestation of life on Earth, may have been driven by single - celled organisms called foraminifera.

In the early seventeenth century the conviction had grown that these wholes, of which living organisms were the paradigm instances, were not integral wholes but were rather composites, strictly aggregates — which is to say that they were wholes which were no more than the sum of their constituents.

He reminds us that science is still ignorant of the chemical pathways that wonderfully allowed the inert chemicals of the earth's early history to form the more complex chemicals needed by even the simplest living organisms.

A truly Catholic ethic might show more respect for the symbiotic nature of very early uterine life by regarding a woman and her fetus as a single organism, with one informing consciousness — that of the woman.

Geneticists and information scientists have built and are building models for the transition of organic molecules to self - replicating living organisms, based on theories of Earth's early development provided by astronomers, geologists, and oceanographers and on the evidence of fossilized microorganisms discovered by paleontologists.

Early organisms apparently survived the Late Heavy Bombardment — which may have made our planet a much comfier place to live.

Early in life's history, RNA might have catalyzed critical chemical reactions to sustain an organism, doing the jobs of both DNA and proteins.

Experiments now suggest that earlier forms of life could have been based on a third kind of molecule found in today's organisms: RNA.

Although that approach has been successfully used to decipher relations between organisms, calibrating it to measure the time elapsed since the divergence of phylogenetic branches is problematic; concerning the early evolution of life, there is no generally accepted approach.

Exposure to PAHs early in an organism's life cycle can also lead to infertility and a host of developmental problems, says Jeffrey Short, an environmental chemist based in Juneau, Alaska, who works with the marine conservation organization Oceana.

Instead of approaching the origins - of - life puzzle from a chemistry perspective, Ranjan looked at it from a planetary perspective, attempting to identify the actual conditions that might have existed on early Earth, around the time the first organisms appeared.

Aime said that the tree suggests the earliest Agaricales were decomposers or biotrophs, organisms that derive their nutrition from other living organisms, a category that includes pathogens.

The term in vitro, from the Latin meaning in glass, is used, because early biological experiments involving cultivation of tissues outside the living organism from which they came, were carried out in glass containers such as beakers, test tubes, or petri dishes.

Organisms, including the single - celled bacteria living in the ocean at that early date, need a steady supply of phosphorus, but «it's very hard to account for this phosphorus unless it is eroding from the continents,» says Aaron Satkoski, a scientist in the geoscience department at the University of Wisconsin - Madison.

«Biological oceanographers have speculated that early life stages of marine organisms might be particularly sensitive to ocean acidification, but the underlying mechanisms remain unknown for most species,» says David Garrison, program director in NSF's Division of Ocean Sciences, which funded the research through an ocean acidification competition.

The earliest evidence for living organisms dates back almost exactly to the time when the rain of asteroids ended.

Rocks that crashed to Earth could have supplied early organisms with essential molecules that allowed them to store energy, ensuring that they could go on to give rise to all terrestrial life we see today.

There, Liu spotted what many other paleontologists before him had somehow missed: a series of sinuous traces thought to be left behind by organisms of the Ediacaran biota, the planet's earliest known forms of animal life.

Starvation early in life can alter an organism for generations to come, according to a new study in roundworms.

These fossils are approximately 2 billion years old and according to Emma Hammarlund they represent some very early life forms, that maybe tried to evolve into some kind of multicellular organism, but didn't succeed.

And if the fate of an organism is indeed inscribed in the earliest biological inklings of an egg, does life begin with the gametes?

It did, however, temporarily suppress four distinct organisms early in life during the critical window of microbial colonization: Lactobacillus, Allobaculum, Candidatus Arthromitus, and an unnamed member of the Rikenellaceae family, which may have important metabolic and immunological interactions.

Whether the hazards are from accidents, weather, food shortages, or predators, species and organisms that live in dangerous environments will breed sooner, have more young more quickly, and die earlier than species and organisms in safe environments.

After comparing the sequence to those of a variety of other organisms, the researchers concluded that the Mimivirus lineage dates back some 3.3 billion years to the separation of early life into three major divisions: archaea, bacteria, and the more complex eukaryotes.

While on present - day Earth the carbonate formation is dominantly through organic processes (various shell - forming marine organisms are happy to make use of the CO2 dissolved in the ocean), in the early Earth and, presumably, in other Earth - like planets with little or no life the same process can occur inorganically, but somewhat slower, in silicate rock weathering.

These early organisms would have lived 3.2 billion years ago.

My research attempts to integrate these methods in order to investigate important questions in evolution: reconstructing ancestral protein sequences and determining the functional roles of proteins existing in organisms early in the history of life.

Specifically, the amount of stress encountered in early life sensitizes an organism to a certain level of adversity; high levels of early life stress may result in hypersensitivity to stress later, as well as to adult depression.

The Spanish artist Jorge Peris was given early exposure to the Italian public at the 2005 Turin Triennale, where he turned a room into a living organism by covering the walls with live molds

Many studies have demonstrated the risks that ocean acidification pose to marine organisms, such as coral dissolving in more acidic water.6 However, new findings suggest that the August and September time period could be particularly challenging for the earliest life stage of elkhorn coral — an important reef - forming coral of the Caribbean — if we continue on a path of high carbon dioxide emissions.5 Ordinarily each August or September elkhorn corals flood the water with eggs and sperm (gametes) for sexual reproduction.2

Background Ocean acidification is considered by climate alarmists to be detrimental to nearly all sea creatures; and the early life - stages of these organisms are generally thought to be the most sensitive stages to this environmental change.