Which of the following statements gives the best evidence that gravity pulls objects toward the center of the Earth?
A. Several iron nails are pulled toward a strong magnet.
B. Winds blow from the South Pole toward the Equator.
C. The density of ice is greater at Earth's equator.
D. Asteroids approaching the Earth from any direction get pulled toward the Earth.

Which property of a rock remains unchanged by mechanical weathering? a. total surface area b. size and shape c. mineral composition d. sharpness

Which of the following nuclei would be the least stable a 2 protons, 2 neutrons b 1 proton 1 neutron c 1 proton 3 neutrons d 1 proton 2 neutrons

Consider a culture medium on which only gram-positive organisms such as staphylococcus aureus colonies can grow due to an elevated nacl level. a yellow halo surrounds the growth, indicating the bacterium fermented a sugar in the medium, decreasing the ph as a result and changing the color of a ph indicator chemical. this type of medium would be referred to as a differential and enrichment culture.