Using the graph above, describe the relationship between the birth rate and death rates over time.

A) The birth rate and death rate have steadily declined.

B) No relationship can be stated based on the data from the graph.

C) The birth rate has generally declined and the death rate has remained nearly constant.

D) The death rate has generally declined and the birth rate has remained nearly constant.

the corpus luteum secretes estrogens and progesterone. the latter hormone causes changes in the uterus that make it more suitable for implantation of the fertilized ovum and the nourishment of the embryo. if the egg is not fertilized, the corpus luteum becomes inactive after 10–14 days, and menstruation occurs.

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the potatoes have high sugar concentrations and although these potatoes were different we could seethe effects that their sugar concentrations had in different environments. for example, the potatoes in sample a, were placed in pure water. this created a hypertonic environment and caused the potatoes to draw in water from its surroundings. we saw the opposite happen with the potatoes in sample b when placed in the sodium chloride solution. the potatoes in this case were in a hypotonic solution and therefore lost water to their surroundings.