What organism has a nerve net that allows it to respond to a stimulus in a coordinated way?

A) Clam

B) Hydra

C) Shark

D) Earthworm

If malaria were eliminated from a certain area, how do you think the frequency of the sickle cell allele in that area would change

What types of information caused scientists to add the level of domain to the system of classification?

How are these cells unique

A bacterial cell measures 2.5 micrometers (µm) in length. What is the size of this cell in nanometers (nm) ?

It has been suggested that men in many cultures tend to marry women younger than themselves because men are genetically predisposed to seek female features associated with youthful fertility. This suggestion BEST illustrates:a.

Explain why the fact that invasive species did not co-evolve with the native species unbalances an ecosystem.

What is dioxyribonucleic acid?

Which list contains only bones that form part of the orbit of the eye?

Which of the following would be an example of species diversity? the number of different kinds of plants in an ecosystem the number of different kinds of animals living in all ecosystems the number of different kinds of plants and animals in an

Which of these was not characterized of the first cells on Earth? A. anerobic B. prokaryotic C. single-celled D. contained organelles