Why was the concern over global cooling replaced with a concern over global warming?
a.
the science community needed a cause to frighten the general population.
b.
steady surface temperature increases were noted between the 1970’s and 90’s.
c.
air pollution only became a concern in the 1980’s.
d.
scientists observed severe ocean acidification.

The movement of tectonic plates in two different locations is shown below: two blocks labeled location a and location b are shown. at location a the top layer of the block shows two horizontal arrows pointing towards each other. small dunes are shown in the middle between the two arrows. the block labeled b has a vertical line in the middle. on the left of the line there is an arrow pointing down. on the right of the vertical line there is an arrow pointing up which statement is most likely true? subduction may occur in both locations. earthquakes may occur in both locations. subduction may occur in location a only and a volcanic eruption may occur in location b only. an earthquake may occur in location a only and a volcanic eruption may occur in location b only.

Which of the following protists gets nutrients mainly by absorbing molecules from other organisms through their cell walls and cell membranes? a. amoebas b. water molds c. ciliates d. slime molds

Ais a group of individuals of the same that exist together in the same place at the same time