Answer:
The amniotic sac and its filling provide a liquid that surrounds
and cushions the fetus . It is a site of exchange of essential
substances, such as oxygen, between the umbilical cord and the
fetus. It allows the fetus to move freely within the walls of the
uterus. Buoyancy is also provided
Answer:
D. the use of chemicals, hybrid plants, and machinery.
Explanation: New machinery in the farming industry increased the speed of planting and harvesting crops. It was invented in the late nineteenth century.
Fun fact: Corn was the first hybrid seed crop to be marketed greatly.
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It shows what was happening in the environment by how wide or thin the ring is. The wider the ring the wetter the year was. The thinner the ring. The drier the year was.
Answer:
ABO Typing
Explanation:
The test to determine your blood group is called ABO typing.
<u>Answer</u>: C. Neutralization of stomach acid.
Hydrochloric acid is one of the three components of the stomach acid. The other two are potassium chloride and sodium chloride.
It plays a key role in the destruction of some ingested microorganisms. It is also vital to the digestion of proteins by activating the enzyme pepsin.