Please help! anatomy final exam!! thanks:) Which of the following is(are) true about the female reproductive system?
a. Ovarian follicles contain egg cells in various stages of development.
b. The primary reproductive organ is the fallopian tubes.
c. If an egg is not fertilized, it implants in the uterine wall.
d. Eggs stay in the ovary after they are fertilized.

Which statements best describe the differences or similarities between a comparative investigation and an experimental investigation? check all that apply. experimental investigations are best for showing cause-and-effect relationships, while comparative investigations do not necessarily show this type of relationship. comparative investigations are often impractical and unrealistic, while experimental investigations are the most practical and realistic kinds of investigations. comparative investigations allow for the use of a wide range of variables but do not have a control group, while experimental investigations involve variables that can be controlled. both experimental investigations and comparative investigations are designed to answer scientific questions. both experimental investigations and comparative investigations focus on making observations rather than collecting new data.