Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

Invertebrates (and higher animals) can also be placed in one of two groups based on how they develop as embryos.
Invertebrates (and higher animals) can also be placed in one of two groups based on how they develop as what?

Energy do ecosystems absorb on the earth.
What do ecosystems absorb on the earth?

A electron microscope is used to see extremely small objects.

What type of microscope is used to see extremely small objects?