Answer:
DNA or protein can be used as a ''molecular clock'' that tells how long it has been since two species have diverged from a common ancestor. The fossil record is usually derived from sedimentary rocks laid down millions of years ago.
B. 'peripheral proteins' are present, not 'peripheral steroids'.
Carbon is returned to atmosphere by processes like respiration, decaying and burning. It's absorbed from atmosphere by processes like photosynthesis.
Explanation:
Carbon cycle is a diagramatic approach to explain how the mass of carbon is distributed in our atmosphere, biosphere and earth, and how the cyclic processes run to exchange the carbon mass between themselves.
As far as the pool is concerned, carbon is present as carbon dioxide in the atmosphere. Its from where the carbon is taken from, or is deposited into. Carbon dioxide is given off into atmosphere by means of respiration. Its contributed by each and every living creature which are aerobic and take in oxygen releasing carbon dioxide into the atmosphere. Next process is decaying of organic matters by bacteria and other microorganisms which release carbon dioxide into air. The third process is burning of fuels which releases carbon dioxide and Carbon monoxide into air.
There are several processes by which carbon dioxide is absorbed into the system from atmosphere. One and the most important of them is photosynthesis. This process absorbs carbon dioxide to produce glucose and other organic matters that are then consumed by the whole biosphere as food.
Answer:
The caudal fin, or tail fin, is the main fin used to move the fish forward in the water, while the dorsal fins help the fish balance and keep it from rolling over. The paired fins help with steering and hovering.
Explanation:
