Allele frequency:
Number of times an allele occurs in a gene pool compared with the number of alleles in that pool for the same gene
Answer:
A. Books and DVDs can be given new life as well.
These layers<span> do not correspond on a one-to-one basis with the </span>compositional layers<span>. The Earth has five mechanic </span>layers<span>: The lithosphere is the outermost mechanical </span>layer<span> and is the most rigid </span>layer<span> of the Earth. The lithosphere consists of the crust, and some of the uppermost mantle.</span>
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.
