What is often the fist step in scientific inquiry?

Consider the following reaction: 2h2 + o2 —> 2h2o a) what are the reactants in this reaction? b) what are the products in this reaction? c) how many molecules of oxygen are used in this reaction?

Modern sea star larvae resemble some primitive vertebrate larvae. this similarity may suggest that primitive vertebrates

Crystallization from cooling magma disvribe one way that a atoms bond b protons attract electronsc ions combine d minerals form