Cyanobacteria are important to the evolution and advancements of other life on earth because they
a) were the first life form on earth.
b) produced oxygen from photosynthesis.
c) were the first group of organisms to leave a fossil record.
d) were thought to have become mitochondria in the cells of animals.

Based on the topographic map of mt. st. helens, what is the contour interval of the volcano about height is 2,950 m?

Directions: read the descriptions of the four islands presented in the lesson. 1. list two new traits that each new species of rat might demonstrate as it adapts to the conditions on each island. 2. introduce one of the four new rat species to another island and describe one challenge it would encounter and one success as it adapts to its new environment.

Which statement is a physical property? becomes moldy quicklyeasy to digestconducts electricity poorlydoes not burn