The chemical composition of soil in a certain area was found to differ from that of the bedrock beneath it. Which statement would best explain the difference in chemical composition? A. Water washed iron oxide from the A horizon to the D horizon
B. The climate, especially rain and extreme temperatures, caused the soil to develop
C. The soil layers were mature because a large amount of time had passed
D. Water, wind and gravity transported weathered particles of rock to new locations

Question 7 of 10

Plz ! a frog has a genetic mutation in skin cells that causes part of its skin to turn orange the frog will not pass this genetic mutation onto its offspring because, a. the offspring will inherit skin cells from the other parent. b. mutated skin cells cannot divide and produce daughter skin cells. c. skin cells do not contribute genetic material to sex cells. d. parents do not contribute genetic material to their offspring.

Which of the following was not a major animal on land during the carboniferous period? amphibians insects both a and b none of the above

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