The sac that surrounds and protects the heart is called the:

Sweating and breathing is an example of differentiation specialization maintaining homeostasis metabolism

If the dimensions of a cube-shaped cell with a length,height, and width of 1 micrometer were to double, what would be the cell's new ratio of surface area to volume? a.3 to 1 b.4 to 3 c.1 to 2 d1 to 6

Why is carbon the backbone of liveing things