A geochemical cycle is the pathway that involves the movement of elements or substances in the Earth's surface and the crust. I believe the answer are hydrologic, heat, and rock. These are the three main geochemical cycles of the Earth and are responsible of continuously removing and adding materials here on Earth.
Bacteria are single celled prokaryotic organisms. Prokaryotic means that they do not contain membrane-bound organelles. In simpler terms, they don't have cell parts within their cytoplasm. Bacteria are classified by their shape- round or cocci, rod or bacilli, and spiral or spirilla. Bacteria may also have long whip-like tails called flagella or be covered with small hair-like projections called cilia. Both structures are used for movement. Bacteria may have a cluster of free floating DNA in its cytoplasm called a nucleoid or they may have additional small rings of DNA called plasmids. Lastly, a bacterium have a cell wall made of a special compound called peptidoglycan which can provide an extra layer of protection from many environmental conditions.
Answer:
D
Explanation:
A: Superior Vena Cava
B: Pulmonary Artery
C: Left Ventricle
D: Aorta
Question states there is an issue with the sound of blood flowing through the aorta, therefore the answer is D
I would have to say it was in the 1860s
