i will give brilent to best answer

which of the following statements is true?

all mutations are harmful.
mutations are the only way to add new genes to a gene pool.
in substitution, dna base pairs are deleted or lost during replication.
a mutation in the liver cell of a cat will be inherited by the cat's offspring.

Competition occurs between species when

An organism has the following traits multicellular cant photosynthesize has a skull. wht kingdom does this organism most likely belong too?

8) animals respond in various ways to stimuli detected through their senses. some of these responses are stimulated by the presence of danger. which of these animal responses is the best example of a response to an immediate threat? a) a rooster crows every morning at the first sign of light. b) as something approaches an octopus, it shoots a cloud of ink. c) from late fall until spring, bears hibernate to preserve energy. d) a dog is getting hot in the sunlight, so he moves to a shaded area.