Question 12 (3 points) The diagram below shows four objects in the solar system which have equal masses.
1
3
4
2.
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Which of these pairs of objects exerts the least gravitational force on each other? (3 points)
Оа
Ob
Object 1 and Object 3
Object 4 and Object 3
Object 1 and Object 2
Ос
Od
Object 4 and Object 2

Animals respond in various ways to stimuli detected through their senses. some of these responses are stimulated by the presence of danger. which of these animal responses is the best example of a response to an immediate threat? a) a rooster crows every morning at the first sign of light. b) as something approaches an octopus, it shoots a cloud of ink. c) from late fall until spring, bears hibernate to preserve energy. reactivate d) a dog is getting hot in the sunlight, so he moves to a shaded area.

The softest and hardest minerals are: softest hardest

State the below theories and give the name of the writer of the theory 1. wave theory 2. quantum theory 3. corpuscular theory 4. electromagnetic theory