A whale is a mammal and a shark is a fish, but they have similar body plans. This is an example of .

regulation of gene expression. gene expression can be regulated by various cellular processes with the aim to control the amount and nature of the expressed genes. these regulatory proteins bind to dna and send signals that indirectly control the rate of gene expression

explanation:

x would be the most and the least would be y because there are more fruit   and seeds than flock z has insects

youre right there are

desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.