Species are defined as organisms that interbreed naturally and produce viable offspring.
<span>there are some animals that can interbreed, such as horses and donkeys, but their offspring are not fertile.</span>
Answer:
D. It can act as an enzyme
Answer:
Helper T cells are arguably the most important cells in adaptive immunity, as they are required for almost all adaptive immune responses. They not only help activate B cells to secrete antibodies and macrophages to destroy ingested microbes, but they also help activate cytotoxic T cells to kill infected target cells.
Explanation:
Helper T cells become activated when they are presented with peptide antigens by MHC class II molecules, which are expressed on the surface of antigen-presenting cells (APCs). Once activated, they divide rapidly and secrete cytokines that regulate or assist the immune response.
Usually in high-rise buildings, many people bring in plants whether they're real or fake, but D is not the answer. A does not make sense because building adds pollution. B isn't correct because it didn't specify if the building would be near water. C is the answer because animals live in the natural landscape.
