What fractional part of a pound ia is an once

How do populations survive when the environment changes

Anna [14]

Answer:

i don't know if im right but honestly i could be A B or C

Explanation:

but i would say if its humans adapting to the environment and if an animal probably the same thing but maybe A more than C

8 0

3 years ago

Describe at least 2 patterns you notice about objects in the solar system using the model provided. (the solar system)

Lelechka [254]

1st pattern

Planets like, mercury, venus earth: they are in the increasing order of there masses. however this chain breaks at mars.

2nd pattern

Planets like, jupiter, saturn, uranus, neptune are arranged in decreasing order of there masses.

Really don't know that my explanation even any sense but have just tried.

4 0

3 years ago

Which is formed when a chromium ion with a 3 charge combines with an oxygen ion with a 2- charge.?

wel

Cr2O3...................

3 0

2 years ago

Question: Using your understanding of the 4 macromolecules explain how Earth’s early atmosphere and the 4 molecules taught could

Zielflug [23.3K]

Answer:

Advanced forms of life existed on earth at least 3.55 billion years ago. In rocks of that age, fossilized imprints have been found of bacteria that look uncannily like cyanobacteria, the most highly evolved photosynthetic organisms present in the world today. Carbon deposits enriched in the lighter carbon-12 isotope over the heavier carbon-13 isotope-a sign of biological carbon assimilation-attest to an even older age. On the other hand, it is believed that our young planet, still in the throes of volcanic eruptions and battered by falling comets and asteroids, remained inhospitable to life for about half a billion years after its birth, together with the rest of the solar system, some 4.55 billion years ago. This leaves a window of perhaps 200-300 million years for the appearance of life on earth.

divine interventionThis duration was once considered too short for the emergence of something as complex as a living cell. Hence suggestions were made that germs of life may have come to earth from outer space with cometary dust or even, as proposed by Francis Crick of DNA double-helix fame, on a spaceship sent out by some distant civilization. No evidence in support of these proposals has yet been obtained. Meanwhile the reason for making them has largely disappeared. It is now generally agreed that if life arose spontaneously by natural processes-a necessary assumption if we wish to remain within the realm of science-it must have arisen fairly quickly, more in a matter of millennia or centuries, perhaps even less, than in millions of years. Even if life came from elsewhere, we would still have to account for its first development. Thus we might as well assume that life started on earth.

How this momentous event happened is still highly conjectural, though no longer purely speculative. The clues come from the earth, from outer space, from laboratory experiments, and, especially, from life itself. The history of life on earth is written in the cells and molecules of existing organisms. Thanks to the advances of cell biology, biochemistry and molecular biology, scientists are becoming increasingly adept at reading the text.

An important rule in this exercise is to reconstruct the earliest events in life's history without assuming they proceeded with the benefit of foresight. Every step must be accounted for in terms of antecedent and concomitant events. Each must stand on its own and cannot be viewed as a preparation for things to come. Any hint of teleology must be avoided.

3 0

2 years ago

Before a cell can divide, it must copy one ___ at a time in a process called DNA replication

Mkey [24]

Before a cell can divide, it must copy one NUCLEOTIDE at a time in a process called DNA replication.

DNA replication is the process by which two identical DNA molecules are formed from one single, original DNA parent molecule. DNA replication takes place in all living organisms and is the basis for inheritance. During this process, the DNA make a copy of itself by copying all the nucleotide that are present in it.

6 0

3 years ago

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