Enzymes act as catalysts because ...

a) they raise the activation energy

b) they maintain activation energy

c) they lower the activation energy

d) they use activation energy

What must be true for natural selection to happen? A. The population must be below carrying capacity. B. Resources must be limited in the ecosystem. C. There can be no competition for resources D. There must be no predators in the ecosystem.

Eutrophication decreases algae's ability to reproduce quickly. true false

Types of calcareous marine microorganisms

Spongy bone is also called

Which conditions are worst for fossil formation weathering

Describe what happens to an egg during the first 14 days of the cycle?

In an axosomatic synapse, neurotransmitter is released from?

A 9-year-old child who has cerebral palsy and scoliosis also is mentally challenged and blind. the child is incontinent, has contractures of the elbows and wrists, and sits in a customized wheelchair most of the day.

List five physical factors from the environment that are essential to human life

A brown fruit fly was crossed with a black fruit fly as shown below. What is the probability of a resulting offspring being black? A. 100% B. 75% C. 25% D. 50%