In the early 20th century it was known that the cell's nucleus contained two kinds of chemicals. it was discovered that the molecule of inheritance is composed of and not protein as was previously thought.
a. lipids
b. rna
c. dna
d. starch

Amouse that is homozygous for the dominant trait has the genotype . it has . a mouse that is homozygous for the recessive trait has the genotype . it has . image of fur color of mice

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.

9. the history of life on earth is recorded in