Which characteristic do all protists have? 1. They all make or consume food. 2. They all survive in any environment. 3. They are all unicellular. 4. They all have flagella.

The first signs of cellular differentiation occur in the blastocyst. why is cellular differentiation important for the development of a fully formed human infant?

(drag each tile to the correct location.) categorize each term as something that is typical of a scientific theory, a scientific hypothesis, or both. - a tentative statement used to guide scientific investigations. - makes predictions about future events. - can be tested by many independent researchers. - based on observations of natural phenomena. - a well-established, highly reliable explanation.

How does the nervous system affect the excretory system?