The right atrium receives blood returning from others parts of the body through the superior vena cava and the inferior vena cava.
Explanation:
The pathway of circulation begins in the right atrium which receives the carbon dioxide-rich deoxygenated blood returning through the systemic circulation.
The deoxygenated blood from regions superior to the heart, i.e., the head, neck, shoulder areas are collected through the superior vena cava and that from the parts inferior or lower to the heart like visceral organs, extremities, trunk, hip etc are brought through the inferior vena cava.
Both these venous systems (superior and inferior) fill the right atrium.
The right atrium then pumps the deoxygenated blood to the right ventricle via the tricuspid valve.
The right atrium is filled with blood during diastole.
Answer:
B. Clams and squid have been evolving separately for a shorter time than clams and snails.
Explanation:
A molecular clock is a genetic tool often used in Evolutionary Biology which states that the genetic material and proteins evolve over time at a relatively constant rate. Therefore, the differences in their genome depend on the common ancestor both species share.
In this case, clams and squid are more closely related than clams and snails. Therefore, they have been evolving separately for a shorter time than clams and snails.
Explanation:
(1)Starch
Carbohydrates are molecules that supply energy and provide support consist mainly of sugars or starches in long chains and rings to form monosaccharide monomers. Inclusive of monosaccharides, disaccharides and polysaccharides (which describes the type of bonding and the degree of complexity of the polymers), their basic makeup comprises C, H, O -with many polar OH groups.
Many long chain polysaccharides are made up of glucose joined by regular 1-4 glycosidic bonds used as energy storage (produced through phtosynthesis) and used for ATP synthesis via respiration, ethyl alcohol fermentation and lactic acid fermentation. Plants are mostly comprised of structural units cellulose and lignin. However, cellulose is their main structural polysaccharide, found within cell walls.
It is made up of special β, 1-4 glycosidic bonds, which give structural polysaccharides their rigid, strong structure; cellulose is not water-soluble and is highly stable. When arranged in α 1-4 glycosidic bonds these molecules are water-soluble and form the stable storage molecule starch. Starch is the main storage reserve in plants- the polymer is produced after glucose production in photosynthesis.
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Answer:
The structural adaptations of the flying squirrel has developed a good sense of balance, sail-like fur skin membrane that extends from the wrists to ankles, delicate wrist bones that control this membrane, allowing the squirrel to steer, and a fluffy tail that balances out and stabilizes the flight.
Answer:
Enolase is an enzyme that catalyzes one reaction in glycolysis in all organisms that carry out this process
Explanation: