6. Plants that have nitrogen-fixing bacteria in their roots are called

A fertilizers

B nitrifiers

C ammonias

D legumes

Which of the following statements about the solar system's formation is true? 1. The temperature was very cold 2. Gravity pulled together a cloud of gas and dust 3. Objects formed from the same materials 4.

The most reliable indicator that a person is experiencing an acute myocardial infarction (MI) is a. severe, crushing chest pain. b. dysrhythmias. c. pain radiating to the lower legs. d. ST-segment elevation.

Explain the process of Natural Selection

Signal transduction:. a. Relies on the uptake of an external signal molecule from the cell. b. Relies on the release of an internal signal molecule from the cell. c. Relies on cell surface proteins changing shape.

What is 6 mutagens chemical or physical agents?

The process by which organ systems maintain a relatively stable internal environment

Which cells in your body contain your entire DNA code? A) Nerve cells only B) Brain Cells Only C) All your cells

Which of the following is a scientific question

Terry has recently been diagnosed with an inherited form of depression. which of the flowing is the most likely cause or the depression? a. Terry has a mutation in the enzyme involved in NE synthesis b.

What makes water a polar molecule? Choose 1 answer: It has fully positive and negative charges. It contains ionic bonds. C) It is able to dissolve nonpolar substances. It contains partial positive and negative charges.