Which of the following statements is true about the three processes that can occur
as sunlight enters into earth's atmosphere as solar radiation?
the earth's surface can only directly absorbs solar radiation.
b) the solar radiation can be absorbed by clouds and the atmosphere.
c) the solar radiation can be reflected by clouds and the atmosphere back into
space.
d) b and c only
e) all of the above

Where do homologous chromosomes exchange genetic material through crossing over?               a.  chlorophyll    b.  centrosomes    c.  centromeres    d.  chiasma

Of seawater increases with decrease in the temperature. therefore, the cold water sinks to the deeper layers at the bottom

Which of the following statements is correct in hour our immune system responds to a potential pathogen? a. the adapted immune system will call on the innate immune system to destroy the pathogen. b. b cells will start reading the antigen code immediately and call t cells to assist in destroying the pathogen. c. the skin will be the first line of defense, and then the many phagocytes in the bloodstream will attempt to consume the possible pathogen. d. the t-cells in the adapted immune systems are the first to recognize the pathogen vaccines are weakened forms of disease causing microorganisms, which are given to patients to prevent disease. after the vaccine is administered, the immune system responds by creating a(n) to recognize the a. antigen, antibody b. antibody, antigen c. antibody, antibiotic d. antibiotic, antibody