Answer:
Platelets are passed through the walls of the bone marrow capillary to the blood.
Explanation:
Platelets can be described as fragments from the cytoplasm which are made from the megakaryocytes taken from the bone marrow. From the bone marrow, they enter directly into blood.
The function of platelets is majorly in blood clotting. Platelets form clumps at the site of blood vessel injury hence causing a clot to be formed. The life span of the platelets or thrombocytes in the blood is eight to nine days. Phagocytosis of the old platelets occurs in the liver as well as spleen.
Well, biotic factors are living things in an ecosystem such as animals or insects. Abiotic factors are non living things in an ecosystem such as sunlight or temperature. I would say biotic factors would be more harmful since this includes bacteria or other diseases, not many abiotic factors would pose a great threat to the entire human species. Hope this helped.
Hydroelectric power because the rest are disadvantages.