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The concentration of solutes in most soil is lower than the concentration of solutes in root cells, so water enters the roots by

In animals, a sphere of embryonic cells surrounding a fluid-filled cavity is called a

Calcium ions are required for muscular contraction.

Cells that produce fine fibers of collagen in cartilage are osteocytes.

Which of the following is not a member of the gymnosperms?

Bones can provide calcium to the rest of the body if it is needed.

The aboveground portion of the plant is called the shoot.

Mycobacterium tuberculosis is an obligate aerobe. In which organ would you expect to find these bacteria?

Soybeans will have several hundred Rhizobium nodules per plant and may divert 20–30 percent of their energy generated by photosynthesis to the nodules instead of other plant functions. Why would the plant divert so much energy to Rhizobium?

The cuticle is