The pigment responsible for giving skin tissue its hue is

Two populations of a species of frog live around the Gulf of California. One population has a brown back, and lives on rocky islands with brown rocks and little vegetation.

What method of thermal energy is used when ice is melting? Conduction, convection, our radiation?

Which is an important source of carbon monoxide emissions that contributes to the greenhouse effect?

How many variables should you change in a controlled experiment? one two four as many as possible

Which distinguishes vertebrates from invertebrates? A) Invertebrates live in the ocean. B) Invertebrates develop into fossils. C) Vertebrates are predators. D) Vertebrates have a central nervous system.

What effect does an increase in the average kinetic energy of an object have? A. reduced particle movement B. Lower temperature C. higher temperature D. increased mass

In beetles, the gene for color and the gene for pattern are located on the same chromosome and exhibit recombination.

At what phase of meiosis is the number of chromosomes per cell doubled? What happens after that so that the number of chromosomes per cell does not end up being higher?

Unlike endocrine glands, exocrine glands a. release hormones. b. do not usually have ducts. c. release secretions outside of the body. d. release secretions directly into the blood

How the structure of DNAallows it to serve as the basis for inheritance?