What is the main difference between organisms that share many characteristics and organisms that do not

Why are the trends and exceptions to the trends in ionization energy observed?

How does a hydroelectric power plant converts energy into energy.

Zoe is investigating the composition of substance a, an unknown substance. using chemical processes, she analyzes substance a and determines it is composed of sodium, oxygen, and hydrogen atoms in a ratio of 1 : 1 : 1. what is substance a? a. a compound b. an element c. a heterogeneous mixture d. a homogeneous mixture