The center of an atom is a nucleas. you can find this answer in most textbooks on science
Cell walls are supporting structures that help the plant to have a fixed shape and protect it from injury,animal cells do not need to keep the structures because they have the skeletal system to protect the organs and cushion them against any external injuries.
Answer: Agammaglobulinemia
Explanation:
Agammaglobulinemia may be defined as the inherited immuno deficiency disorder. The antibodies are present in minute amount in the serum of the affected individual.
Agammaglobulinemia is a type of the medical condition in which the body is unable to produce gamma globulins. The lymphocytes like B and T cells are absent in this disease.
Thus, the correct answer is option (1).
Elephants in the savanna regions of Africa dig holes in dried up river beds to reach water lying just below the surface. These holes provide drinking water for other animals as well. So, without the elephants, many animals might otherwise die from lack of water during the dry season. The location in which the elephants live is an example of a/n habitat and the role they play in creating water holes is an example of a niche.
As the salinity of water increase the density of water decreases.
Answer is false
