What is wrong with defining physical activity as "voluntary movement, intentionally performed for specific purposes, that requires a substantial amount of energy"?

Study this image. which statements best describe the rock shown? check all that apply. the grains of this rock are jagged. this rock has several coarse grains. the grains in this rock are very large. this rock has a non-banded pattern. the color of this rock is determined by its texture.

The law of thermodynamics states that energy can't be created or destroyed. to natural sources of energy on earth are the

Which of the following is a true statements about viruses? viruses have no nucleus. viruses are alive. viruses have a cell membrane. all viruses are deadly.