Waxes (option a) is correct
Answer:
The continents were once connected as one landmass.
Explanation:
This did happen it's called Pangea. There were similar fossil records in different continents.
Answer:
antibodies bind to antigens on the infectious agent which are then destroyed by lymphocytes
Crossing over can create genetic variation. Crossing over is when chromosomes cross over they give + take a part of another chromosome which can create different variation in genes.
