What contains a chemical message or code?

Human beings are part of Earth's ecosystems. Thus, human activities can, deliberately or unintentionally, alter the equilibrium in ecosystems. Humans often change ecosystems as a result of population growth, consumption, and technology.

The carbon in coal, oil, and natural gas come from

How long will humans live on Earth?

In which stage of the Calvin cycle does the plant cell produce energy for storage?

1. What was the independent variable in this lab? * A. water volume B. water mass C. time D. soil type

What one element makes up the "base" of all four of these macromolecules?

Osmosis is the diffusion of water across a selectively permeable membrane in which water moves from a solution containing a low concentration of solute to what kind of solution? A. a solution containing the same amount of solute B.

When mixed, which states of matter form only a homogeneous mixture?

Do bats communicate with infrasound

The primary source of energy for most cells is