Answer:
true
Explanation:
b. vein
c. lymph
d. artery
The right answer is vein (it contains blood and has valves).
The infra-cardiac veins of small and medium caliber possess this system of fight against gravity. The valves consist of a dense connective tissue, surmounted by endothelial cells, corresponding to a fold of the intima. They allow blood circulation in the sense organ / heart but prevent venous reflux.
Answer: b. vein
Vein is a blood vessel that exhibit thin muscular walls and it brings the deoxygenated blood from all the cells, tissues and organs back to the heart. In the veins the valves are present which prevent the backward flow of blood. Lumen of the vein is wide.
According to the above information vein is the correct option.
Answer:
It's best to avoid fertilizers generally.
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Check your septic system. Just as manure encourages algae to grow, so does human sewage. ...
Don't use a garburator. ...
Combat shoreline erosion. ...
Don't lather up near water sources. ...
Be careful with your detergents. ...
Minimize impervious surfaces close to the water where possible.
Explanation:
This is what I found According to Google :)
b. Wheat and corn are common products of tropical plantations.
c. Most crops from tropical plantations are exported.
d. Cocoa, coffee and tea are common products of tropical plantations.
The right option is; b.
Wheat and corn are common products of tropical plantations is not true concerning tropical plantations.
Tropical plantations is a type of agriculture in which perennial plants are grown for several years. Tropical plantations are usually practiced in regions with humid, tropical climates and plants such as cocoa, coffee, tea, coconut, rubber and oil palm are the common crops that are cultivated. The crops are mostly exported and they serve as important source of income. Wheat and corn are not common products of tropical plantations .
Answer:
B
Explanation:
sea-floor spreading?