What percentage of earth's water is usable fresh water?

Imagine you are looking out at a field of flowers. 774 plants have red flowers; 226 plants have white flowers.

An earthquake decimates a ground-squirrel population, killing 98% of the squirrels. The surviving population happens to have broader stripes, on average, than the initial population.

Which statement best describes a situation where competition occurs in an ecosystem? (1) A deer outruns an attacking wolf. (2) A deer, during the winter, consumes tree bark. (3) A deer and a rabbit consume grass in a field.

What enzyme connects new nucleotides and proofreads them in separated DNA strands?

What system takes the longest to develop in a fetus?

What happens to euglena when sunlight is not present?

There are many differences among humans. However, all humans belong to the same species because they A. can communicate with one another using sound. B. can mate with one another to produce fertile offspring. C. all give birth to live young. D.

hat kind of macromolecule is made from amino acids? carbohydrate protein lipid nucleic acid

Discuss the importance of legislation to protect marshes.

Imagine a community where there are trees, moose, and wolves. The beetles eat the trees, and the spiders eat the beetles. Which of the following lists the species from most to least biomass (or number of individuals) correctly.