The most common bone shape in the body is the long bone shape. One of the principal features is a shaft called a(n) diaphysis that contains a hollow, cylindrical space inside called the medullary cavity. In children, this cavity contains bone marrow, which is later replaced by bone marrow in adults. An end of these bones is called a(n) . The other three bone shapes in the body generally have an external surface composed of bone and the interior is composed entirely of bone.

d.

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your answer should be c) enjoy!

explanation:

the universal gravitation equation. since the gravitational force is directly proportional to the mass of both interacting objects, more massive objects will attract each other with a greater gravitational force. if the mass of one of the objects is doubled, then the force of gravity between them is doubled.

many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.