Because of biogeochemical cycling,
a. human activity has no effect on elements, chemical compounds, and other forms of matter.
b. living organisms are not limited by any one nutrient.
c. nutrients are circulated throughout the biosphere.
d. many nutrients do not reach toxic concentrations in the biosphere.

The steps in the formation of extrusive igneous rocks are listed below in an incorrect order: 1. rock melts due to high temperature. 2. rock is buried deep under earth's surface. 3. magma is forced out of earth's surface during volcanic eruption. 4. lava cools and crystallizes to igneous rock. which of these best shows the correct order of steps in the formation of extrusive igneous rocks? 1, 3, 4, 2 2, 1, 3, 4 3, 4, 2, 1 4, 2, 1, 3

Dna replication occurs in preparation for

What happens to the amount of waste in the pond as the ecosystem ages?