Which rock type is an example of igneous glass? 1. lava

2, gabbro
PLS HURRY
3. obsidian

4. rhyolite

Find the number of grams of hcl needed to react completely with .50 moles of magnesium.

What term is applied to a scientist who studies ancient life, including animal and plant fossils a. anthropologist b. dendroclimatologist c. geophysicist d. paleontologist

#7 how does the structure of amino acids allow them to form a polypeptide? each amino acid has an amino group and a carboxyl group. each amino acid has a hydrogen atom and a carboxyl group. each amino acid has a carboxyl group and an r group. each amino acid has an r group and a hydrogen atom.