Which factor affects the heart rate in mammals?
a. rbc count in blood
b. blood type
c. need for oxygen
what one?

Option C

Explanation: The factors that affect the heart rate of an human is need for oxygen. If there is a need of oxygen then the heart will pump blood very fastly to meet the demand of oxygen.

When there is a normal supply of oxygen in the body then the heart pumps the blood in a normal heart rate.

correct answer: false

while planning water activities, it is very important to consider the weather, because if we do not plan and are going for a surf, then it might be that the hurricane came and drown us or may carry us to long distance from where we can not come back. there are many reasons to take information about the weather when we are planning any water activities.

hence, the correct answer would be false.

here is the answer

water, ice, acids, salts, plants, animals, and changes in temperature are all agents of weathering. weathering is the breaking down or dissolving of rocks and minerals on earths surface. once a rock has been broken down, a process called erosion transports the bits of rock and minerals away.