Evidence for sea-floor spreading has come from a. changes in the depth of the ocean. c. ancient climatic conditions. b. magnetic minerals on the ocean floor. d. the breakup of Pangaea.

2. Which kind of nutrients cycle through the atmosphere?

Select the characteristic echibited by viruses

The moon is older than earth by approximately 300 years?

What is the role of messenger rna and ribosomes in protein synthesis?

Essential nutrients a. are made by the body b. can only be supplied adequately with dietary supplements c. must be obtained through diet d. consist of over 75 different types of nutrients

What is the outermost structure that surrounds and supports plant and fungal cells?]

The sun is A. luminous; it gives off its own light. B. illuminated; it gives off its own light. C. luminous; it reflects light.

An increase in a herbivore populations in an ecosystem will soon lead to

This aquatic area is one of the most productive on Earth. More organic matter is created ere each year than comparably-sized areas of forest, grassland, or agricultural land. This body of water is a (n) A) estuary. B) lake. C) river. D) swamp.

The type of relationship described could best be classified as one of