What do atoms connected by covalent bonds share

What are some aquatic organisms that live in cold water temperatures?

Consider the last statement in the prompt: "people take such environmental factors into account in their choices when deciding where to live." do all people have a choice as to where they live? what factor plays a key role in this decision and may therefore play a large role in determining quality of life?

How does natural selection change thephenotypes within a population over time?