Q: Which theory explains how populations of organisms can change over time? Choices: - free by natural selection - changes by natural selection - intelligent selection - evolution by natural selection A:
evolution by natural selection

(Question)
Q: Which is the ultimate energy source in a bear's food chain? Choices: - decomposers - plants - heat - sun A:
(Answer)
sun

Ques: Q: What is the process in which glucose is made using energy in light called? Choices: - glucosynthesis - photogenesis - gluconeogenesis - photosynthesis A:
Ans: photosynthesis

(Q).
Q: How many valence electrons can be found in a carbon atom? Choices: - five - three - One - four A:
(A).
four

Ques:Q: Energy that is stored in a person or object is called? Choices: - vertical energy - mechanical energy - kinetic energy - potential energy A:

Ans:potential energy

Ques: Q: Huge calderas form when the mountain above an empty chamber of what collapses? Choices: - gas - mercury - coal - magma A:
Ans:
magma