Which of these four cells has the largest actual size?

In the skeletal system, which are the two main tissues responsible for structural support in the body?

attashe74 [19]

Bones and cartilages <span />

5 0

3 years ago

True or false? in host-versus-graft rejection, the recipient recognizes the donor tissue as foreign and rejects the transplant;

snow_tiger [21]

The statements above are true;
In a host-versus-graft rejection the recipient's immune system recognizes the donor's tissue as foreign and rejects the transplant. On the other hand, in a graft-versus-host rejection, the donor tissue recognizes the recipient's tissue as foreign and the transplant rejects the recipient, causing destruction of the recipient's tissue and possibly death. Its important also to note that there are two types of rejection, the acute rejection, where the rejection of transplanted tissue that occurs several weeks after transplant. it is delayed hypersensitivity reaction, and the chronic rejection is a rejection of transplanted tissue that can occur at a late time. Immune complexes form in the arteries supplying the graft, choking off the blood supply and the tissue is rejected.

5 0

3 years ago

50 points!!! please define the philogenetic species concept and please explain it with an example, it's realy urgent

pickupchik [31]

Phylogenetic species concept (PSC) The concept of a species as an irreducible group whose members are descended from a common ancestor and who all possess a combination of certain defining, or derived, traits (see apomorphy). ... "phylogenetic species concept." A Dictionary of Biology. .

Or

The biological species concept has its limitations (although it works well for many organisms and has been very influential in the growth ofevolutionary theory). ... In thisexample, Ensatina salamander lineages A and B are separate species.Each has a common ancestor that individuals of other species do not.

I hope that this helps you out