During sexual reproduction, egg and sperm cells join to form a new individual. Each cell in a human contains 23 pairs of chromosomes (46 total chromosomes). How does the chromosome number of our species stay the
same from generation to generation during meiosis? Why doesn't the chromosome number double every
time a new generation is formed?

Which of the following correctly list the first appearance of organism in the fossil record from earliest to most recent

Ineed to get this test done which of the following statements is correct in hour our immune system responds to a potential pathogen? a.) the skin will be the first line of defense, and then the many phagocytes in the bloodstream will attempt to consume the possible pathogen. b.) b cells will start reading the antigen code immediately and call t cells to assist in destroying the pathogen. c.) the adapted immune system will call on the innate immune system to destroy the pathogen. d.) the t-cells in the adapted immune systems are the first to recognize the pathogen

14. which of the following codons code for threonine? a. ucg b. ugu c. cga d. aca