Newton's law of universal gravitation states that... 1. small masses don't exert gravity on larger masses 2. earth's gravity cancels out the gravity that any other object might have 3. you exert a gravitational force against earth 4. all of the above. PLEAS HURR

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

Which statement is true for bacteria a. bacteria have complex internal structures b. all bacteria are spiral in shape c. all bacteria cause disease in animals d. bacteria break down some foods

Which of the following is the earliest era of earth's geologic time scale? cenozoic mesozoic precambrian paleozoic