These are structures which are similar in different organisms because they evolved in a similar environment, yet do not have a common ancestor.

example: the torpedo shapes of both sharks and dolphins

What is the next step in muscle contraction after the actin changes shape? (apex)

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 .

Identify the examples in which sam interacts only with natural resources