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when handling cat litter, humans can potentially be exposed to a harmful single-celled
protozoan. its primary host is the common domestic cat but it can also live in humans. this
protozoan is an example of?

Imagine that you have produced several versions of lactase, each of which differs from normal lactase by a single amino acid. describe a test that could indirectly determine which of the versions significantly alters the three-dimensional shape of the lactase protein.

Scientific evidence tells us that the cause of earths four season is the tilt of earth as it revolves around the sun. the student is instructed to illustrate this information in a science notebook. how will the student illiterate winter in the northern hemisphere?

What natural processes produce large quantities of co2