Under normal conditions, when cells are not in contact with other cells this will signalthem to divide. when cells are too closely packed together they will stop dividing. these are examples of signals.
a. external
b. chemical
c. internal
d. none of the above

Which sentence best expresses the differing opinions of these two book reviews?

How water is moving through the ecosystem ?

Sort the examples by the type of diversity that they exhibit a park has 80 species of trees red, yellow, and orange bell peppers are all members of the same species individuals of the same lizard species have different mating strategies. five different bird species are at a bird feeder. genetic diversity species diversity