Antibodies are produced when the body is exposed to A. white blood cells. B. receptor proteins. C. antigens. D. macrophages.

Why are skeletal muscles striated

How does the structure of the sacred lotus flower relate to reproduction

The brain of the nervous system and the endocrine glands of the endocrine system are similar to one another in certain ways. Both act to send messages to distant body parts. What is a significant difference of the activity of endocrine glands? A.

The major atmospheric byproduct of photosynthesis is

It is estimated that animal - or insect-pollinated plants produce 1000 pollen grains for each ovule; wind-pollinated plants produce 1,000,000 pollen grains for each ovule. What does that indicate about pollination systems

What is the difference between a autotroph and a heterotroph?

Which of the following is a biotic factor of an ecosystem? * a. grass b. a rock c. air

How might plants arrived on surtsey?

The process by which water moves across a cell membrane is called a. Osmosis b. Exocytosis c. Resolution d. Active transport

6. Allison ran a marathon for the first time. The next day she was stiff and store. Which of the following is a reasonable explanation of why her mucles were sore? a. Calvin Cycle c. alcohol fermentation b. Kreb's Cycle d. lactic acid fermentation