Explain the math behind a geologic time square

Organisms that successfully adapt will leave to grownone of the above

The transport tubes for food coming down the plants are called?

Dna. we have heard that we are a product of our dna. but where is it? how do we "get" our dna? it is passed to us, from our parents, but in what form? several vocabulary words associated with inheritance are used interchangeably and sometimes, incorrectly. let's see if you can clear this up for someone just learning about inheritance and cell structure.