Answer:
Explanation:hmm think about your vocab
Due to divergent evolution, some species may have similar anatomical structures with the same purposes. The species while not exactly similar are close enough to allow the interbreeding of the two, such as the horse and mule
<span>Opaca and Marginal zone stays outer and does not move during chick gastrulation,
The zone opaca is a thick fringe ring comprising of more than one cell, it is joined to the germ wall. The Marginal zone lies at the fringe between the range opaca and the region pellucida</span>
Answer:
1) Macrophages ingest antigen 2) Helper T cells are activated 3) B cells differentiate into plasma cells and memory cells.
Explanation:
Innate immunity and adaptive immunity provide protection against foreign invaders. Innate immunity is non specific and adaptive immunity is specific immune response; includes the production of antibody after a sequence of events.
- When an antigen enters the body the phagocytic cells such as macrophages and dendritic cells ingest the antigen by a process called as phagocytosis. These cells act as antigen presenting cells and present it to T cells.
- T cells are of two types T helper cells and T cytotoxic cell. T cytotoxic cells killed the affected cell such as affected by virus while T helper cells signal for the production antibodies.
- Antibodies are produced from the plasma cells while memory cells act as record keeping. The plasma cells are stimulated by interleukins.
The best and most correct answer among the choices provided by the question is the fourth choice "cenozoic"
The other two are the Mesozoic and Paleozoic Eras. TheCenozoic<span> spans only about 65 million years, from the end of the Cretaceous </span>Period<span> and the extinction of non-avian dinosaurs to the present. The </span>Cenozoic<span> is sometimes called the Age of Mammals, because the largest land animals have been mammals during that time.</span>
I hope my answer has come to your help. God bless and have a nice day ahead!