The answer is B. Cell membrane and cytoplasm
The cardiovascular system focuses more on pumping blood all throughout the parts of the body which mean the heart, capillaries, veins, and arteries are all involved in this. The Respiratory System is all about the gas exchange that is happening in your body which involves the lungs, oral and nasal cavities.
The correct option is D.
The Endangered Specie Act was enacted in 1973. It is an environmental law which provides for the conservation of species that are endangered or threatened and the preservation of the ecosystem in which they live. The law prohibit the catching and killing of endangered species.