Answer:
Cardiac output
Explanation:
In the circulatory system, blood is pumped in and out of the heart to other body organs by veins and arteries.
The amount of blood that is pumped by the heart can be measured.
Cardiac output refers to the amount of blood that is pumped per minute by the heart.
It is an important measure because cardiac output indicates how efficient the heart meats the body demand
It is determined by the stroke volume and the heart rate.
Answer:
Convection occurs through the movement of particles. As particles become heated, the molecules move faster and faster, and as molecules move apart, density decreases. The warmer, less dense material rises compared to the surrounding cooler, higher density material.
Explanation:
The first land plants appeared around 470 million years ago, during the Ordovician period, when life was diversifying rapidly. They were non-vascular plants, like mosses and liverworts, that didn't have deep roots
