Human activity contributes to the extinction of species. which is not a human activity that contributes to the extinction of a species?
a. introducing a nonnative species
b. hunting
c. fungal disease
d. cutting down forests

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.

What is usually (but not always) related to the metabolic processes of living organisms in its organic form?

Why do some dna fragments move farther than others during gel electrophoresis? a. because their shapes are different b. because they are different types of molecules c. because the samples are different colors d. because their masses are different