When holding a guitar or flute, the elbow joint bends when the

A. triceps muscle contracts.

B. triceps muscle relaxes.

C. biceps muscle contracts.

D. biceps muscle relaxes.

Two species regularly come into contact and form hybrids that have higher fitness than either of the parental species. what are some likely consequences of regular hybridization between these species? check all that apply.

What is the function of the cell membrane?

Which of the following features is common to both acids and bases?

What is a common result of the collision of two continental plates? A. very long fault lines B. formation of island chains C. lava flows into valleys D. folded rock layers

What, measurement unit represents volume? (A) Kilometer (B) square centimeter (C) centigram (D) liter

2) The population of mice in a local forest ecosystem has recently died out due to disease. In the past, these mice were the main predators of the forest beetles.

Which DNA bases pair with each other? How many hydrogen bonds are shared by each pair?

Which layers of sedimentary rock at Grand Staircase Escalante National Monument do you think are the oldest?

Animals in the higher trophic levels generally share two characteristics. They are typically

Name two ways that carbon enters the atmosphere