The Greek root "ek" means "outside of" or "around"; thus, "ecto" would be the outer layer, as in ectoplasm.
Ecto = outside.
ANSWER Time.
From the Latin word laxus, meaning "loose"
Calor is the Latin word for "heat".
it means air and it is a Latin root word
ectoderm-the ouside of the skin , noun
unite
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single
People
The Latin root stimu translates to goad
If you mean aquarium, the root is aqua- Latin for water.