Answer: Bar 3
Explanation: Because when the roller coaster goes up its kinetic energy (High) then when it is at the top it's potential energy(Low).
Answer: sagittal plane
Explanation: sagittal plane is one of the body planes,the others are coronal and transverse.
The sagittal plane divides the body into left and right portions.
Dividing the body into plans is important in the study of anatomy as it helps in precision of the part of the body under consideration and it prevents errors.
Four conditions are needed for natural selection to occur: reproduction, heredity, variation in fitness or organisms, variation in individual characters among members of the population. If they are met, natural selection automatically results.
