During egg cell reproduction in a human female, the 21st pair of chromosomes may fail to separate. this failure to separate is known as

Scientists say that conditions must be "just right" for a hurricane to start up. Which is the first step of "just right" in the development of a hurricane? A) Cool ocean water replaces warmer surface water.

Animals have tissues what are some of them called and what do they do?

Which of the following is a reason for discovering a new drug? A. To confuse patients and physicians B. To replace a less-affective drug C. To Create a new disease D. To duplicate an older drug

Unicellular has a cell wall single chromosome

The visceral and parietal pleural membranes are normally held together by

If the same parents have four boys, what is the probability their fifth child will be a girl?

Natural selection is often called survival of the fittest. However, often times breeding or artificial selection will create offspring create population different from the population of their ancestors.

Explain how micro evolution and migration can effect an ecosystem

What do all viruses have in common?

Sheath of schwann cell containing cytoplasm is called