During the process of fertilization, which step happens first?
a. the sperm s nucleus enters the egg cell.
b. enzymes break down the protective layer of the egg cell membrane.
c. a sperm attaches to a binding site on the egg cell membrane.
d. the cell membrane of the egg cell changes

How do symptoms created by inflammation the doctor

(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.

Identify the composition of oceanic and continental crystal rocks. in a model of earth’s interior, where would these rocks appear?