Which of these processes does not occur in animal cells?
a. respiration
b. photosynthesis
c. chemical reactions
d. making proteins

The correct answer is option B, that is, photosynthesis.  

The procedure by which some kinds of bacteria, plants, and certain protozoans utilize the energy from the sunlight to generate glucose from water and carbon dioxide is known as photosynthesis. It does not take place in animals.  

This glucose produced is then transformed into pyruvate that discharges ATP by the process of cellular respiration, in the process oxygen is also produced.  

"menstrual cycle is a complex cycle that consists of several processes. order of occurrence of steps in menstrual cycle are as follows:

1. high progesterone levels maintain the endometrium lining of the uterus.

2. endometrium lining breaks down and low levels of estrogen stimulate the pituitary to release fsh and lh.

3. fsh and lh stimulates the follicles to develop and the oocyte to produce estrogen.

4. rising estrogen levels suppress fsh production and development of other follicles.

5. a spike in lh causes follicle to rupture.

6. a breakdown of corpus luteum causes progesterone level to drop."

straight or amphibians are homeothermic to thermal