What two structures generate the cells responsible for immune responses?

•B lymphocytes and T lymphocytes
•thymus and lymphocytes
•bone marrow and lymphocytes
•bone marrow and thymus

Free brainliest! what is a characteistic of the american stradfordshire?

Which excerpt from the land, part 4 best supports the claim that paul is a talented horseback rider? a/“figure that says more than anything else! now, i want to ride that stallion! " b/my daddy shook his head. "paul only rides horses he knows. ” c/? i glanced over at the other rider. the fellow was older than i, and had the weight of a man on him. d/a man out of alabama, man name of ray sutcliffe, told my daddy i was such a good rider, he wanted me to ride some races for him.

Select the correct answer.what is the observable characteristic of a person called? o a. genotypephenotypeoc.alleleo d.gene