Which of these is required for natural selection to occur?

a. un-equal reproductive success.

b. inheritance.

c. individual variation.

d. all of the answers are correct.

Which of the following describes the physical state of the layers of the Earth from the outside to the center? A. solid, solid, partially, melted, liquid B. solid, liquid, solid partially, melted C. solid, partially, melted, liquid, solid

Looking at a cell under a microscope, you note that it is a prokaryote. How do you know? (a) The cell lacks cytoplasm. (b) The cell lacks a cell membrane. (c) The cell lacks a nucleus. (d) The cell lacks genetic material.

All of the joints of the vertebral column are synovialâfreely movableâexcept one. which joint is not? a. zygapophyseal b. costovertebral c. intervertebral d. costotransverse

Tanisha is a diabetes educator at a local clinic. Recently, she was offered a lavish trip by a sales representative who has been pushing the clinic to use his company's diabetes supplies. Tanisha declined the gift.

Based on observations, you create steps to test whether the presence of water could accelerate the growth of bread mold. These steps would be A. a conclusion. B. a hypothesis. C. an experiment. D. an analysis.

Base your answer to the following question on the statement below and on your knowledge of biology. Some internal environmental factors may interfere with the ability of an enzyme to function efficiently.

What causes the cell membrane to expand and burst

What is study of plants called?

Which process is most responsible for the increase in early Earth's atmospheric oxygen levels?

Which organ systems are attacked by smallpox