All species are either or choose the correct answer from the following choices, and then select the submit answer button. extant; extinct evolving; not evolving higher; lower protected; endangered vertebrates; sponges

extant; extinct.

Explanation:

A species is a group of individuals that can interbreed to produce fertile and viable progeny. A species may be present on the earth and is surviving or may not be present now on the earth and have become extinct due to one or more reasons. Extant species are the species living on the earth in the present time while extinct species do not exist now. For instance, Plateosaurus engelhardti is a species of dinosaurs that survived on the earth during the Triassic period but does not exist now. On the other hand, Homo sapiens, Apis indica are some of the examples of the extant species that are surviving on the earth.

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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: