According to Darwin, natural selection is based on the ___found in populations.

A. acquired characters

B. variations

C. weakest members

D. similarities

This group of animals is primarily aquatic and has mandibles and two pairs of antennae. Which group is this?

Which scenario describes a mutually beneficial relationship with fungi in an ecosystem? A) fungus growing inside an anthill. B) fungus growing on the leaves of plants. C) fungus used to make medications for humans.

When you take a deep breath before diving underwater, air is forced into your lungs by the contraction of your ... - alveoli - lungs - diaphragm - heart

Is an allele for a trait that has no effect on a species fitness affected by natural selection?

What is a poditive feedback?

The gas that makes up about 21 percent of the atmosphere is?

Under the microscope, a cell shows formation of centrosomes and spindle microtubules. What will happen next?

What is a measurement of the earth's history divided into time periods A) fossil record B) sedimentary rocks C) geologic time scale D) radioactive elements

The initial organisms on earth were essentially prokaryotic heterotrophs. how did they obtain their energy?

Lynx feed on rabbits, and the growth curves for these two species fluctuate together. This relationship is an example of a (n) Select one: a. S-shaped growth curve. b. J-shaped growth curve. c. irregular fluctuations. tightly linked cycle.