What do we call the speed needed for a projectile (like a cannonball) to overcome the force of Earth's gravity?

The following image is of a diatom. it lives in water and gets food from photosynthesis. it is encased in a hard shell made of something similar to glass or sand . a diatom is a(n) because it has a) multi-celled organism; specialized parts. b) vertebrate; a skeleton. c) insect; an exoskeleton. d) single-called organism; only one cell.

Types of scientific inquiry that biologist engage in that cannot be completely controlled

In which part of the body is a ball-and-socket joint found?