A boy pushes his sister on a swing. What is the frequency of oscillation of his sister on the swing if the boy counts 90. Complete swings in 300. Seconds?

Which of these terms are associated with communication between neurons? chemical signals, electrical signals, synapse chemical signals, synapse, neurotransmitters synapse, electrical signals, chemical signals synapse, electrical signals, neurotransmitters

Why do you need to classify the size of a particle

"what factors influence the absorption of sunlight at earth's surface? "