What percentage of earth's liquid surface freshwater is found in rivers?
a)0.9%
b)2%
c)11%
d)87%

The following image is of a diatom. it lives in water and gets food from photosynthesis. it is encased in a hard shell made of something similar to glass or sand . a diatom is a(n) because it has a) multi-celled organism; specialized parts. b) vertebrate; a skeleton. c) insect; an exoskeleton. d) single-called organism; only one cell.

Aflashlight battery is an example of a) potential energy b) kinetic energy c) thermal energy d) solar energy

What does the hardy-weinberg principle relate to? a. chances of survival of an organism b. frequency of alleles in a population c. natural selection in a species d. causes of evolution among organisms