Answer:
541 million years ago with the Cambrian explosion, an extraordinary diversification of marine animals, and ended about 252 million years ago with the end-Permian extinction, the greatest extinction event in Earth history.
source- Britannica
Explanation:
The correct answer to go in the blank would be ''laws''.
Answer:
Enzymes are involved in the formation and composition of every cell in the body. Thus they also control the working of every organ and even the brain - the control center. They are involved in the breakdown, absorption, distribution and circulation of various nutrients entering the body.
Explanation:
B - Many Agricultural practices bear some pretty bad impacts on the environment. A, C and D are incorrect.
<span>vestigial structures because they are hard </span>