If his sperm count is less than 20 million per millimeter, a man is considered

a. impotent. b. hormone intolerant. c. infertile. d. sterile.

If each cell has multiple mutations, why do most of us have normally-functioning tissues and organs?

Which type of rock would most likely be weathered by acidic groundwater to produce a cave? * A) Siltstone B) Basalt C) Quartzite D) Limestone

Definition of Carbon Dioxide in six words

What is the most important way to prevent a foodborne illness from bacteria? a. prevent cross-contamination. b. practice correct cleaning and sanitizing. c. practice good personal hygiene. d. control time and temperature?

What is the time between Sunset in darkness

Which type of microorganism causes malaria? A. virus B. protozoan C. bacterium D. fungus

Which of the following makes ice cores so useful in determining the composition of the atmosphere in the past? A. the presence of pollenthe B. temperature of the core C. air bubbles D. fossilized plants

Describe how dominant and recessive alleles are represented in a Punnett square

What does adaptive radiation cause? A. Higher extinction rates B. Higher gene flow C. Higher biodiversity D. Higher genetic drift

How does each new cell formed by cell division differ from the mature cell? OA. Each new cell has a larger ratio of surface area to volume. OB. Each new cell has different information in its nucleus. OC.