The answer is D) certificate of deposit
The cardiovascular system consists of the heart, blood vessels, and blood. This system has three main functions: Transport of nutrients, oxygen, and hormones to cells throughout the body and removal of metabolic wastes (carbon dioxide, nitrogenous wastes). Hope this helps!
The correct answer of the given question above would be sea floors or underwater. The research submersibles like Alvin are useful in studying sea floors or underwater. The Alvin submersible is owned and operated by Woods Hole Oceanographic Institution and was built in 1964. Hope this answer helps.
I believe the answer is descriptive research
Descriptive research is a form of research that conducted in order to spot/find out the characteristics of certain phenomenon.
This type of research does not necessarily aim to identify the cause or the solution of the phenomenon