How long ago did the first homo sapiens live

Individuals do not compete directly for resources, but are prey for the same predator

Explain the source of radioactivity in uranium in earth’s crust by which it produces nuclear radiation

What is one way intensive agriculture can contribute to climate change? a. tree loss to agriculture increases earth's albedo b. livestock manure absorbs greenhouse gases c. large herds of livestock release greenhouse gases d. fewer trees are available to replenish petroleum stores appex