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A sponge’s structural materials (spicules, spongin) are manufactured by the

The organ level of structural organization comes before the tissue level of structural organization.

Most plants have vascular tissue; these constitute the ________ plants.

Most plants have vascular tissue; these constitute the ________ plants.

Do hormone signals cause an effect faster than nerve signals?

Which of the hyphae shown below is an example of septate hyphae?  

If I pour used motor oil on the ground it would poison my drinking water.

If I pour used motor oil on the ground it would poison my drinking water.

Which of the hyphae shown below is an example of septate hyphae?  

How much of the energy stored at each trophic level is available to the next level?