How does the development of an embryo provide clues to the evolution of present day organisms?

Florian discovers a rock that is broken into pieces. each piece has several bands. which type of rock does florian predict these pieces will change into when subjected to heat and pressure? igneous magma metamorphic sedimentary

Why is it incorrect to say that mitochondria function only as energy factories with cell

What element is able to combine with itself and hydrogen to form large molecules ?