According to the current theory, the earth's moon was formed

a.
together with earth
c.
from a portion of earth
b.
separately from earth
d.
from a leftover star

In general, characteristics that an organism survive and reproduce become more common over time. what mechanism of evolution causes this?

Kinases add - groups to other enzymes. this activities some enzyme while inhibiting other

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