21)

a. crossing over results in the exchange of genetic material of homologous chromosomes.
b. fertilization produces offspring with varied genetic combinations.
c, chromosomes are randomly assorted into gametes.
d. at the completion of meiosis, all four gametes differ.
e. no two offspring can ever be identical.
meiosis produces gametes during sexual reproduction. as seen here, meiosis results in four haploid gametes. review the process as well as the results of meiosis, paying particular attention to the green circled area. what statements, in the prompt, accurately describes what is modeled here?
a) a - e
b) a - d
c) a - c
d) a and b

idk lol use google m8

blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. as the ventricle contracts, blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs where it is oxygenated.

above statement is not a true statement about the open ocean because the open ocean has low levels of nutrients. most of the photosynthetic activity on earth occurs in the open ocean within the photic zone. organisms in the deep ocean are exposed to frigid temperatures and total darkness but it does not begin at the low-tide mark.