SC.912.L.18.7 Which of following would decrease the rate of photosynthesis in a plant?
A. a decrease in the amount of carbon dioxide in the air
B. a decrease in the amount of oxygen in the air
C. an increase in the amount of oxygen in the air
D. an increase in the amount of carbon dioxide in the air

A. It is 100% A.

Explanation:

Because plants need carbon dioxide to photosynthesize

the level of progesterone is low at the pre-ovulatory phase of the cycle but it gradually increases and the levels are high at the luteal phase. if pregnancy occurs, the level of progesterone will be high throughout the pregnancy.

if egg is fertilized and the mother gets pregnant, progesterone starts preparing the uterus for the implantation. it starts building up the lining of uterus and make it hostile of the period of pregnancy.

stimulus is a change in the environment that causes an organism to react. the response is the reaction to the stimulus. some examples of stimuli for zebras are drought, to many predators, and bad feeding grounds such as dead grass or plants. zebras respond to stimuli just like all other living organisms