Sperm are the primary source of testosterone? true or false

Which of these is a difference between a DNA and an RNA molecule? A. DNA contains nitrogenous bases, whereas RNA contains phosphate groups. B. DNA is usually double-stranded, whereas RNA is usually single-stranded. C.

This is the set of skills needed for animal to survive in its environment

Effects of corona virus in the respiratory system and circulatory system?

In horses, the allele for black coat color (E) results in production of a hair pigment called eumelanin and is dominant to the allele for chestnut (e). A horse breeder mates a black mare to a chestnut stallion and a chestnut offspring results.

Which type of pollution is believed to have the most impact on an ecosystem? Select one from the choices given: disease. volcanic eruptions. floods. chemical spills

Which statement about crustaceans is true? * (A) all have the same number of appendages (B) all have an internal skeleton (C) all have an exoskeleton (D) only some have jointed appendages

5. The measurement of the amount of friction a surface will generate is called the of friction'.

How much of earth's air is made of Nitrogen?

If a normal cell divides, you can assume that a. its surface area has become larger than its volume. b. its volume has become larger than its surface area. c. it has grown to its full size. d. it has grown too large to meet its needs.

What type of isolation occurs when species mate at different times of the year?