Which three body systems work together to obtain and distribute oxygen and nutrients?

Because of their increased protein needs, it is unhealthy for athletes to choose to become vegetarians. because of their increased protein needs, it is unhealthy for athletes to choose to become vegetarians. a. True b. False

Lactic acid fermentation in humans can lead to cramping due to lack of

Plants need bacteria in order to take up and use which element?

Dark skin (a result of increased melanin production in equatorial peoples) is likely a response to ultraviolet radiation, because uv radiation can cause:

Cellular respiration would be a catabolic reaction. True False

Games like tag and hide and seek are examples of: A: Constructive play B: Fantasy play C: Creative play D: Motor play E: Parallel play

Explain in a complete sentence why it is important for scientists to share information with one another.

The DNA message depends on the order of the a. nitrogen bases. b. acids. c. sugars. d. genes.

How to tell if a fossil is older

Males have only one copy of each type of sex chromosome; therefore, all sex-linked genes are expressed, even recessive alleles. Based on this information, which statement is true? A.