The pyloric valve control food movement from the stomach into the small intestine.
Answer:
The correct answer is option C.
Explanation:
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19. The atomic number indicates how many neutrons there are, and the atomic mass tells us how many protons and neutrons are present within the nucleus of an atom.
Explanation:
Genetic conditions such as trisomy (three chromosomes) or monosomy (only one chromosome). They can also determine the fetus' gender by looking at the XY / XX chromosomes.
I think its B, by showing the people how species can become invasive
