Answer:
Determination
Explanation:
Cell determination is one of the fundamental processes that result in the development of the form of an organism. Cell determination refers to a series of molecular events that alter the activities of certain genes in a particular way. These events finally make a cell to progressively commit to a particular differentiation pathway.
The events of cell determination may not cause any immediate changes in the structure and function of the cells but regulate them eventually. Once the cell determination events make a cell to differentiate in a particular way, the cell is specialized to carry out specific functions which means that its development fate is sealed.
<span>B. Marsupials. </span>Amniotic eggs is a unique kind of egg because they possess a semipermeable shell to protect the egg but it also allows gas exchange. Inside an amniotic egg contains the amnion, chorion and allantois. Animals that lay amniotic eggs are called amniotes, which include reptiles, birds, dinosaurs, monotremes (platypus).
The nervous system is the major controlling, regulatory, and communicating system in the body. It is the center of all mental activity including thought, learning, and memory. Together with the endocrine system, the nervous system is responsible for regulating and maintaining homeostasis.
Answer:
B
Explanation:
Arteries and arterioles (small arteries) have muscular walls. They're the main blood vessels involved in vasoconstriction. ... Capillaries are tiny, thin-walled blood vessels that can't constrict.