The atmosphere: protects the earth from harmful radiation is made mostly of nitrogen traps heat from the sun can be used to transmit radio signals is important in the water cycle

Are substances released into the environment that in excess amounts cause damage

The first three phases of the cell cycle are collectively known as (1 point) play audio cellular respiration. telophase. mitosis. interphase.

Why are fossils not found in igneous rocks? igneous rocks are made from cooling of lava or magma. igneous rocks are found too deep underground. igneous rocks are too dark in color to contain fossils. igneous rocks are too dense to contain fossils.