On earth there are four main jet streams: two polor jet streams and two __ jet streams

How many trophic levels are there in the following food chain? phytoplankton - shrimp - perch - pike - osprey

Which is a genetic engineering advancement directly related to a career in biotechnology? 1) improving solar energy collection 2) transporting textiles at higher rates 3)creating crop foods that resist insect pests 4)repairing historical sites with quality materials

Rarefaction is used for which of the following? a. creating a representative sample b. studying how disease impacts populations c. rediscovering species thought to be instinct d. determining which sea creatures live in an area