Nutrient is a key component in cell membranes, neurons, and certain hormones

clumped distribution, because you'de have all of the population gathered in a relatively small are.

it's the most common because it provides protection and a mate for reproduction

example: humans, seeweed, cattles, etc.

if someone had the list of traits you provided

yes, because even though a theory has a  lot of evidence to support it, it is not always true

carbon traps heat so more of it makes it hotter causing global warming. during the ice age carbon levels in the atmosphere were low so it got very cold. so the common things between them is carbon levels in the atmosphere.