The elephants are the keystone species in the Savannas of Africa. The ability of the elephants to knock over the several feet high acacia trees for feeding purposes makes the savannas a grassland. If the elephants were to disappear than the population of acacia trees will increase and the Savannas will be converted from grasslands to woodlands. It will lead to the disturbance of diversity in Savannas.
Answer:
b. An antihistamine blocks receptors for inflammatory chemicals released from granules within mast cells.
Explanation:
The mast cells situated at the body surfaces are responsible for alerting the immune system when a local infection is detected. This induces the secretion of inflammatory chemicals from granules within the mast cells once activated. Histamine is released which causes the blood vessels to expand and the skin to swell, thereby protecting the body. This leads to the production of symptoms like sneezing and rashes.
This allergic response to the perceived antigen is initiated as a result of the degranulation of the mast cell.
An antihistamine helps in stopping the histamine from affecting the cells in the body by blocking the receptors for the inflammatory chemicals released from granules within mast cells
Sponges are sessile animals that have specialized cells called amoebocytes and choanocytes.
Sponges (phylum Porifera) are one of the simpllest multicellular organisms (first to branch off the evolutionary tree from the common ancestor of all animals) that have bodies full of pores and channels allowing water to circulate through them. Sponges’ s structure consists of two thin layers of cells and mesohyl layer between them. They don’ t have real tissues or organ systems such as nervous, digestive or circulatory systems. Constant water flow through their openings and pores obtain food and oxygen and remove wastes.
Answer:
They bring nutrients towards the shore, increasing the abundance of organisms.
Explanation:
The status or conditions under which the organism died from and how was it buried. That would be your answer.