Is one way to develop active immunity to a disease.
a.
chemotherapy
c.
a vaccine
b.
taking vitamins
d.
all of the above

One statements is an example of a scientific observation. another statement is an example of a scientific explanation. identify the correct statement for each category to illustrate how scientific explanations are inferred from scientific observations.

Why is the theory of evolution important? it disproves all other theories about how life began. it provides a topic for debate. it is a unifying concept in biology. it explains how life began. i know for sure, it is not "it is a unifying concept in biology."

Which organelle plays a role in intracellular digestion?