A leech feeding off of human blood is an example of 1

commensalism

competition

mutualism

parasitism

predation

If an allele is dominant, how many will an offspring need to inherit to see the dominant phenotype

16. If a defective gene occurs on the X chromosome, it will normally be transmitted to male offspring only by A. the mother B. segregation C. the father D. mutation

Explain why water logged soils are usually deficient in nitrates

What unique ability do DNA molecules have? Why is this ability so important?

Why does a siren have a lower pitch as it moves away from you? O The troughs of the sound wave are spaced closer together, O The crests of the sound wave are farther apart.

The gametophytes of an unknown plant are contained within the sporophyte, and the plant produces separate male and female gametophytes. Which the following is the best conclusion about the life cycle of this plant? a.

How many variables should you have in a control experiment?

How is science different from other subjects such as art or history

What happens if you don't have enough carbohydrates?

Describe the movement of "air" into and out of the respiratory system. Be sure to include the following structures (larynx, trachea, bronchi, bronchioles, and alveoli) while being specific about whether it is mainly oxygen or carbon dioxide moving