When did photosynthesis first occur?

What are teams of organs that work together to perform an important bodily function

What happens to weather patterns when a cold front approaches? What happens to weather patterns when a warm front approaches?

Which would be the best tool for measuring exactly 20ml of water

Why is the flower described as a reproductive organ?

Ziggurats were made out of all of the following materials except a. mud. c. water. b. granite. d. grass

Aquaculture cannot reduce the number of fish caught in the wild. a. True b. False

Why does the reporter have a tube up his nose? to accurately measure core temperature True or False

Charles Goodyear was a scientist who was looking for ways to keep rubber from melting in the summer heat and becoming brittle in the winter cold. He discovered the solution by accident when someone left a sample of rubber and sulfur on the stove.

Discuss why scientists know so little about Precambrian Earth

If two elements are in the same chemical family then what can be predicted about their Spectra