A new sunscreen has been developed that is supposed to be more effective at preventing sunburn. 30 participants spray one arm with the new formula and spray the other arm with the leading formula. After 4 hours in the sun, their skin is evaluated for any redness. What is the Independent Variable?a. the 30 arms with the old formulab. the 30 arms with the new formulac. Amount of rednessd. Type of sunscreene. the 15 arms with the new formula

The correct answer is : b. the 30 arms with the new formula

Explanation:

Independent variable is a variable that is present in the experiment and research experimenting about and do not depend on any other variable. In this experiment the researcher is experimenting about the new sunscreen and its effect on the people.

In this experiment the 30 arms with new formula is independent variable that would change or altered the dependent variable.

Thus, the correct answer is : b. the 30 arms with the new formula

because the light is a great source of energy for the plants to survive. (i hope this )

"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."