when an antigen attacks the body, it activates adaptive immunity. this adaptive immunity produces a strong response when it encounters the same antigen for the second time. which feature of adaptive immunity is essential for this kind of response?

Which would be the outcome in a fertilized egg if the process of meiosis did not occur? twice as many chromosomes as the parents half as many chromosomes as the parents same number of chromosomes as the parents triple the number of chromosomes as the parents?

Which organelles are involved in energy conversion

Animals such as pronghorn antelope, bison ans badgers dot to the landscape. where are these animals located?