A molecular clock uses mutation rates in DNA to estimate the time that two species have

A) living together

B) comparing mutations

C) coevolving

D) evolving independently

Expanding human populations are forcing many organisms into small, isolated, fragments of habitat. In general, how will this affect levels of gene flow and inbreeding in these organisms?

You plant a flower garden. Which of the following flowers in your garden would be least likely to be pollinated by bees? a) A flower that is red and upright. b) A flower that is red and horizontal. c) A flower that is lavender and upright.

Identify the appropriate time period where vascular plants with woody tissues, seeds, and veins shared the land with spiders, scorpions, insects, and crustaceans, while jawed fish cruised the oceans and the first amphibians left water to visit land.

Name the biological catalysts which bring about chemical digestion of food.

Which of the following is considered a healthy source of energy for the human body? a. fats b. water c. proteins d. carbohydrates

A child who consumes adequate calories but insufficient amounts of protein is most at risk for developing

The area of the cell, located inside the nucleus, where ribosomal rna is made.

When we look at snow melting is it due to the temperature or thermal energy?

Explain why biodiversity is important for the survival of species

How many teeth has fish?