If a pathogen returns to the body, these kind of B and T cells can multiply and fight off the pathogen. (one word, must be spelled correctly)

explanation:

okay now i don't know this but for the pints nothing else to say bye

the cost of mining is extremely low compared to the money earned from mining, creating income to improve the environment.

the answer to the blank provided is “an autosomal gene that is required for the expression of genes on the x chromosome”.

testis-determining factor, abbreviated as td, which is more popularly known as sex-determining region y or sry protein, is a dna-binding protein or  gene-regulatory protein/transcription factor, encoded by the  sry gene. it is the gene responsible for the initiation of male gender determination in humans.

d.embryo is the correct one