Why might so many different organisms develop different traits at later stages but continue to have similar stages of early embryo development? Explain your reasoning.

One of the methods used to reduce energy use is: a. energy efficiency c. energy conservation b. energy reservation d. energy holding select the best answer from the choices provided a b c d i know the answer is not option a

Which of the following is an oxidation-reduction reaction? (pictured below)

Which best describes a gene? a. a sister chromatid b. a chromosome c. a tetrad d. a piece of a chromosome