When echinoderms move in a manner such as walking or crawling, they pump sea water through a series of internal body canals. The water is used to inflate some of the tube feet, causing them to expand. In many species, the tube feet are equipped with suc(k)ers that grip onto the sea floor.
Answer: DNA contains the nucleotides guanine (G), cytosine (C), adenine (A), and thymine (T). RNA contains the nucleotides guanine (G), cytosine (C), uracil (U), and thymine (T). The difference between the two is that RNA contains uracil (U) rather than adenine (A).
The base pairs in DNA are adenine with thymine and guanine with cytosine. The base pairs in RNA are uracil with thymine and guanine with cytosine.
True. Evolution can only occur in a couple of different ways (for example: survival of the fittest), all of which occur over long periods of time.
Cell wall and cell membrane are both in plants and animal cells in fact in all cells because they are the protective layer for outsiders
Global Warming is Human caused. Scientists have concluded that most of the observed warming is very likely due to the burning of coal, oil, and gases.
