Answer:
The correct answer is option a. "Cross-sectional study".
Explanation:
A cross-sectional study is a type of observational study used in medical and social researches. Cross-sectional studies are characterized by the analysis of data that comes from a population at a specific point of time. A research that involves studying the incidence of cholera carriers at three different villages with three different types of water supply, is an example of a cross-sectional study.
Well, the system for human reproduction is called just this: human reproductive system. The male and female reproductive systems are different; and male consists most importantly of penis and testicles, which further have their own parts.
The female system is composed mostly of the uterus, (including the vagina, which leads to the uterus, and the ovaries.
IiYy. This shows a recessive pair and a dominant pair
Answer:
guard cells
Explanation:
they control the opening and closing of the stomata
