Have a primitive digestive system
The answer is A. V-shaped trench and B. A bioluminescent fish (apex)
I believe it's aerobic exercise.
Answer: they have to maintain homeostasis, so they remove waste to do so..
A DNA mutation is a permanent alteration in the DNA sequence that makes up a gene, such that the sequence differs from what is found in most people. Mutations range in size; they can affect anywhere from a single DNA building block (base pair) to a large segment of a chromosome that includes multiple genes. DNA mutations can affect an offspring can result in abnormal protein products. Mutations can also introduce new alleles into a population of organisms and increase the population's genetic variation.
