I believe i<span>mproving air circulation.
Hope this helps!</span>
The answers are:
Zinc ,Iron , Copper , silver , lead , mercury .
The correct answer is absence of jaws.
Lampreys and hagfish are in the class Agnatha, they are jaw-less fish. The members of the agantha class are probably the earliest vertebrates. Scientists have found fossils of agnathan species from the late Cambrian period that occurred 500 million years ago.
After a caterpillar eats a leaf, it can convert the chemical energy into mechanical energy to help it build a cocoon.
