Which of the following explains why wind travels from an area with colder air to an area with warmer air? A. The warmer air rises and the colder air fills in underneath it.

B. The less dence colder air spreads out and pushes the warm air.

C. The warm air moves under the cooler air, creating a vacuum.

D. Warm air can’t contain the higher energy of the cold air.

NEED THE ANSWER ASAP!!

the endocrine system secretes hormones into blood and other body fluids. these chemicals are important for metabolism, growth, water and mineral balance, and the response to stress. hormones provide feedback to the brain to affect neural processing. reproductive hormones affect the development of the nervous system.

the correct answer is 2 and 4

passive transport is a movement of biochemicals and other atomic or molecular substances across cell membranes without need of energy input. unlike active transport, it does not require an input of cellular energy because it is instead driven by the tendency of the system to grow in entropy.

so, according to what that says, i believe it's hypertonic and hypotonic.

good luck!

the statements that apply here about binary star system are

"have stars that might appear to wobble"

"often have one star that is brighter than other"

a binary star is a star system consisting of two stars revolving around their common barycenter. systems of two or more stars are called multiple star systems.