When blood sugar is low a) the liver creates insulin. b) glycogen is broken down in the pituitary gland. c) the pancreas secretes glucagon to trigger the liver to release stored glucose. d) the pancreas secretes glucose to increase sugar levels and restore homeostasis.

Which of the following is a main difference in cell structure between an onion cell and a human cheek cell? a. an onion cell contains one nucleus, whereas a human cheek cell contains two nuclei. b. an onion cell has a cell wall. c. a human cheek cell contains chloroplasts. d. there is no difference between an onion cell and a human cheek cell. you for your.

Question 1 of 102 pointswhich best describes adaptive radiation? oa. geographical isolation caused by an adaptationob. biodiversity resulting from few ancestorsoc. a decrease in the rate of speciationd. adaptations that organisms teach each other

Apart of an ecosystem that can restrict the growth of a population is referred to as