How is the respiratory system of the crayfish efficient?

Which hormone is used by both males and female?

S, tall stems (t) is a dominant trait while short stems (t) is a recessive trait. in a field of 1000 sunflowers, 820 are tall plants and 180 are short. which statement best describes the genotype of the sunflowers in the field?

Identify the compound that plants make to store as energy