Which organ system is responsible for gas exchange?

Look at the images of different rocks. which rocks have a fine-grained texture? check all that apply. 1 2 3 4 5

Many plants can reproduce asexually. which of these is an example of asexual reproduction in a plant? a. pine cones forming on a tree b. cross-pollination in a tomato c. roots sprouting from a potato d. night-blooming jasmine flowers

Which of the following is the earliest era of earth's geologic time scale? cenozoic mesozoic precambrian paleozoic