Which science term best describes air a) compound b) element c) mixture

Answer : The correct answer is -

C) mixture.

Air can be described as mixture of gases (such as oxygen, nitrogen, carbon dioxide and several other gases) and certain dust particles along with water vapor.

A mixture is considered as a constituent of two or more particles /substances that are present together  in any composition and do not necessarily undergo chemical reaction. The particles of a mixture can be separated by physical means (unlike compound, which contains particles that react chemically and present in a fixed ratio).

Thus, mixture is a scientific term that best describes air.

the way that the mass of carbon can be conserved through cellular respiration is through a process/law called the law of conservation of mass which even tho it undergoes a process, mass is not be destroyed or changed

"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."