C. They help with gas exchange, and the air taking up the space is lighter than the cells that could be there instead. Also, only cells can carry out photosynthesis, not air.
Blood, the carrier of nutrients, wastes, and gases, circulates within blood vessels through the body, exchanging materials with the interstitial fluid.
Interstitial fluid, formed by filtration from blood, is the fluid surrounding body cells in the tissue spaces and is essential to proteinless plasma.
Lymph is the protein-containing fluid that enters the lymphatic capillaries (from the tissue spaces); hence, its composition is the same as that of the interstitial fluid.
Explanation:
Prokaryotic organisms are type of cells that are clearly different from eukaryotic cells (human or plant cells), since they lack nucleus and other type of organelles and differ with size. ( some of them have flagella which helps these cells to move)
Example: Any type of bacteria can be considered as a Prokaryotic cell
Answer:
A or D
Explanation:
The main consequences of the Fall In petroleum products is the transportation cost of any item will be reduced so the the purchasing cost of the consumer from the dealer will be reduced in a large extent. Due to falling prices of petroleum, more private car owners will afford to fuel their cars hence there will be more cars on the roads.
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The best answer is A.
As soon as the blood vessel wall is broken or damaged, a series of reactions activate platelets so that they stick to the site of injury. The platelets are able to hold to the blood vessel wall by means of a protein substance called von Willebrand's factor.
Collagen and thrombin then act at the site of injury and induce platelets to clump or stick together, forming a mesh that plugs the broken part. Special clotting protein help sequester more platelets to the plug which finally becomes a blood clot.