Which is a common characteristic of extrusive igneous rock? a. cools slowly c. contains small grains b. forms crystals d. contains large grains

The study of interaction between living organisms and their enviroment is called (a) phytogeography (b) ecology (c) phytosociology (d) ecosystem

Which of the following statements are true chromosomes make up genes

Ascientist separates a population of mice into two groups. what would most likely increase the rate of speciation in this population. a. teach the two groups different tricks b. allow the two groups to breed with each other c. put the two groups in different environment d. have the two groups live in identical ecosystems