Answer:
Explanation:
Each daughter cell is haploid and has only one set ofchromosomes, or half the total number of chromosomes of the original cell. MeiosisII is a mitotic division of each of the haploid cells produced in meiosis I
Answer:
b). activation of T cells
Explanation:
An APC (antigen-presenting cell) can be described as an immune cell, which detects, uptakes, and informs the acquired immune response when an infection takes place. B cells, macrophages, and dendritic cells are antigen-presenting cells.
These cells play an important role in activation of T cells. T cells are unable to recognize soluble or free antigens and can only recognize antigens processed and presented by carrier molecules, such as MHC molecules.
Presence of MHCII molecules is a defining feature of APCs that process and present antigens to T cells. Hence, all antigen-presenting cells help in activation of T cells.
Thus, the correct answer is option (b).
Use of chemical fertilizers
Warm Front. A warm front is the surface boundary between a warm air mass and a cold air mass it is overtaking The warm air moves into an area of colder drier air The air masses do not readily mix therefore the warm air rises slowly over the colder air because it is less dense.
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B. because polar bears eat seals, and if the seals are hunted then there is less for them to eat and their species ends up decreasing.