How long ago did homo sapiens appear

The barley plant has seven pairs of chromosomes. For a gamete, the number of genetic combinations that are possible through independent assortment is 256.

Which one of the following is a major contributor to pollution A). riding your bike B). cars driving along a highway C). recycling newspapers D). recycling glass

How do scientists know that the first organisms were simple, unicellular organisms

What dies survivor ship curve mean? What an easy way to remember what it means?

How are virus infections like a "sneak attack"?

Test your knowledge about the specific functions of the five types of white blood cells 1. Release histamine, which promotes inflammation. 2. The cytoplasm is a thin ring around the nucleus. 3.

Which could decrease the human carrying capacity? Question 1 options: corrupt governments energy crisis epidemic disease unequally distributed resources

Explain how a trait might seem to "disappear" for a generation, and then "reappear" in the following generation

What neurotransmitter is released by the axon of a sympathetic preganglionic neuron to communicate with the sympathetic postganglionic neuron?

Is the spinal cord part of the peripheral nervous system?