Why is a control necessary to have when designing an experiment?

What is the water cycle? A. It is the storing of water under, on or above the Earth's surface. B. It is the removal of water under, on or above the Earth's surface. C. It is the continuous movement of water under, on or above the Earth's surface. D.

If evolution is based upon there being genetic diversity between generations, how does the lack of genetic differences existing between daughter cells created via mitosis impact the theory of evolution

A zoologist finds a mysterious worm-like animal, and is trying to identify it. What characteristic would he need to find in the embryo to be able to classify it as a protostome?

How is solid water less dense than liquid water

What effect do fertilizers have on rivers?

Which type of chromosomal mutation causes this form of Down syndrome?

Chlorine is added to kill remaining microorganisms in the water. true or false.

Sensation is the process by which our sensory receptors and nervous system take in stimulus energies from the environment;

1) which of the following describes part of a phenotype? A) Gg. B) homozygous. C) having frekeles. D) heterozygous.

When hardy-Weinberg principle