Could you send the rest of the question please in the comments?
D) one direction
HEART VALVES OPEN TO MOVE BLOOD ONLY IN ONE DIERECTION WHICH IS FORWARD DIRECTION BLOOD NEVER FLOW BACKWARD INSIDE HEART.
In the solar system there is a lot of distance between mars and Jupiter. the main asteroid belt is in this area. what is the reason a planet did not form between mars and Jupiter
a. Planets can only form close to the sun or far away from the sun. This area is a region where planets cannot form
b. This area gets a lot of stellar wind from the sun. planets cannot form in areas that get a lot of stellar wind
c. Mars has two very fast moving moons, these moons prevented a planet from forming in the area.
d. Jupiter's gravity affect this area so much that no planet could form there.
If the temperature is increased, then the amount of oxygen released by the plant during photosynthesis will decrease. If the temperature is too high the enzymes lose their shape and become unable to function properly, and the rate of photosynthesis decreases.
I hope this helps in anyway!
Answer:
The circulatory system delivers oxygen and nutrients to cells and takes away wastes.
Explanation: