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Pond water contains a variety of plant and animal life. While some are visible to the plain eye, others require a microscope to observe them. For example, there's bacteria, protozoa, hydras, algae, and arthropods. You will have the opportunity to see a number of microorganisms from both the plant and animal kingdom.
The state of nature, for Rousseau, is a morally neutral and peaceful condition in which (mainly) solitary individuals act according to their basic urges (for instance, hunger) as well as their natural desire for self-preservation.
Metaphase. In all versions of metaphase the chromosomes line up in the middle of the cell.