Agas is placed inside a very cold box the gas molecules transfer heat to the walls of the box which best describes what happens to the gas as it cools down?
the gas molecules slow down and some change phase to liquid.
the gas molecules speed up due to collision with the walls.
the gas molecules vibrate around fix positions.
the gas molecules gain energy from the cold walls of the box.

answer; ///(b) it is composed of four protein chains and four heme groups;

"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."

measuring light intensity

light meters can be used to measure light intensity. the meter is held at the soil surface and pointed in the direction of the maximum light intensity, and then the meter is read.

errors can be made when measuring light intensity by accidentally shading the light meter. the reliability of the results can be checked by taking many samples.