_______ occurs when one species evolves to resemble another species.
_______ occurs when one species evolves to resemble another species.

_______ occurs when one species evolves to resemble another species.
________ are structures like the wings of insects, birds and bats that have the same function but different evolutionary origins.
___________ like the hind leg bone spurs in snakes are unused structures that are functional in other organisms.
___________ is a morphological adaptation that allows an organism to blend into their surroundings.
Anatomically similar structure inherited from a common ancestor.
A biological community and all the abiotic factors that affect it is known as a(n)
__________ is an organism whose cells contain complex structures enclosed within membranes.
Large group of ecosystems that share the same climate and have similar types of communities
Scientists think that ____________ were the first cells.
The amount of time required for 50% of a radioactive isotope to decay is