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If their karotypes (number of chromosomes) don't match or if they are bred and fail to produce offspring or the offspring are infertile.

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Q: What is an indicator that two similar organisms are different species?
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What is a indicator organisms?

Indicator organisms are organisms that are sensitive to changes in the environment. When populations of indicator species changes, it can signal a change in the environment that will eventually effect other species as well.


What is organic indicator?

Indicator organisms are organisms that are sensitive to changes in the environment. When populations of indicator species changes, it can signal a change in the environment that will eventually effect other species as well.


What is an indicator species?

An analogous organ is a trait that appears similar in unrelated organisms. It indicates that the unrelated organisms are living in similar environments and have evolved similar characteristics to deal with similar problems.


Form of evolution in which different organisms produce species that are similar in appearance and behavior?

Era


A group of similar organisms that can reproduce?

A biological species.


A group of similar organisms that can produce fertile offspring?

A group of similar organisms that can produce fertile offspring are species.


Did Charles Darwin realize that organisms of the same species are identical?

Charles Darwin did recognize and categorize numerous species during his career. He also recognized that not all species were identical in all of their outward physical characteristics. He also realized that organisms of the same species were identical. He also observed that organisms living in different places with similar environment were different yet similar, thus concluding that they had the same ancestors.


Organisms that provide an early warning of environmental damage are?

They are called bellwether species, also known as sentinel species.


What characteristics of the species level of organization distinguishes two similar organisms such as ducks and geese as different species?

Organisms are grouped into species according to their outer similarities so ducks and geese must vary enough to be categorized differently.


What characteristic of the species level of organization distinguishes two similar organisms such as ducks and geese as different species?

Organisms are grouped into species according to their outer similarities so ducks and geese must vary enough to be categorized differently.


A group of organisms sharing similar characteristics?

species


Does territorial behavior extend to organisms of different species?

Yes, territorial behavior extends to organisms of different species.