Probably the main reason africans, rather than native americans, became slaves in america was that? a. indians passed north american diseases to the europeans. b. africans and europeans shared immunities to old world diseases. c. indians were unable to master the work required of slaves. d. africans were already adapted to slavery.

Which of the following is not a main characteristic that scientists focus on when determining which kingdom an organism belongs to

Which of the following describes a negative feedback loop? when the heart rate is too high, the body sends hormones that continually increase the heart rate higher. when a pregnant woman is in labor, the body sends hormones that increase the intensity of contractions, which then increases the secretion of the same hormones. when blood sugar is too low, the body sends hormones that raise blood sugar until it reaches a typical level and hormone secretion slows. when a person is jogging, the body sends hormones that continually decrease the rate of oxygen supply to the legs.

When a human or animal consumes food, the carbon in that food is most likely to be converted into which of the following elements? a. carbon remains carbon b. nitrogen c. oxygen d. hydrogen