Explain two reasons how and why Alfred Wegener initially theorized that continents may have been joined at one time.

Nitric oxide is a paracrine signal molecule because NO A. is slow to diffuse B. is produced in very small quantiites C. is unstable, with a short half life D. binds to cell surface receptors that are veryplentiful.

The process by which plants convert sunlight into chemical energy is cellular respiration diffusion mitosis photosynthesis

What is a segment of DNA that is the basic unit of heredity and is transferred from parent to offspring

Identify the structures a virus can contain. Check all that apply. nucleic acid ribosomes cell membrane capsid envelope

How is the temperature of a liquid substance affected when it is boiling? OA) It increases. OB) It decreases. OC) It stays the same.

Why do you think more blood goes to some organs and not others?

Which of the following would most likely employ a forester? A. a state governments B. lumber businesses C. national govemments D. all of the above

How do environmental scientists use technology to track polar bears?

A rock formed from liquid magma at temperatures above 1000 degrees Celsius and the. Cooked and hardened what type of rock is it

You sample a population of butterflies and find that 56% are heterozygous at a particular locus. What should be the frequency of the recessive allele in this population? A. 0.07 B. 0.08 C. 0.09 D. 0.70