The answer is A. Mixtures can be separated by physical means
A pure substance cannot be separated.
Answer:
mass and energy is reused when those things happen
Answer:the amount of matter the object contains
Explanation:
Answer:
Zymogen ActivationZymogens are activated by snipping the bonds between two or more amino acids, rather like cutting a balloon string so that it floats away. When the bonds are cut, the enzyme changes its conformation, its 3-D structure, so that the active site is free and able to become active.
Explanation: