The planets of the solar system formed as

a) planetesimals flattened into a rotating disk

b) the center of the gas cloud cooled

c) the sun absorbed extra gas and dust from the solar system

d) planetesimals collided into one another

The table shows dates and appearance of index fossils. which rock layers can be dated most precisely? a) a layer containing both a fossil 4 and a fossil 3 b) a layer containing both a fossil 2 and a fossil 3 c) a layer containing both a fossil 1 and a fossil 4 d) a layer containing both a fossil 1 and a fossil 2

Write the balanced chemical equation forphotosynthesis.

Compare the parts of a cell and the cell as a whole to another common nonliving system (i. e., a car, a city, describe the parts of a cell and their primary function.