All veins return blood to the heart. all veins return blood to the heart.

a. True

b. False

The Big Bird and his descendants are a rare glimpse at how a natural hybridization event can form a new lineage from two species that live in the same area.

a frog have more off spring than can survive on available resources which behavior is this an example of

Which of the following is NOT a difference between RNA and DNA in human cells? Group of answer choices RNA is single stranded and DNA is double stranded.

If you have true breeding strains that differ only in a single character, how could you determine which trait for that character is dominant?

If the membrane potential at the axon hillock becomes subthreshold an action potential will be fired. true or false

Which part of the brain consists of two hemispheres? what are some of the functions is controls?

Which best describes nitrogen fixiation A. Nitrogen fixiation is the process of creating free nitrogen for plants to absorb. B. Nitrogen fixiation is the breakdown of nitrogen in the soil. C.

How does an animal's behavior Aid survival and reproduction

The elevation of the metabolic rate that occurs after ingestion of a meal is

For a human baby to be born a boy he must receive what?