Many molecules are moved through the body by . provide structure for plants. determine what people look like. cells are surrounded and protected by . speed up chemical reactions in the body. hemoglobin, a protein, is built b

What are some aquatic organisms that live in cold water temperatures?

Hummingbirds drink nectar from flowers, while robins eat plant seeds. what does this reduce?

Select the correct answer from each drop-down menu. in an experiment, dr. travis examined the effects of calcium intake on osteoporosis, a condition that causes an increased risk of bone fractures. the amount of calcium is variable. the risk of bone fractures .