This graph shows the change in atmospheric carbon dioxide levels i. parts per million (ppm) from 1997 through 2003. Carbon dioxide levels fluctuate naturally from season to season as varying levels of photosynthesis activity capture carbon dioxide from the atmosphere and turn it into plant biomass. Which hotspot on the graph represents a sample taken during the late spring in the Northern Hemisphere, when levels of photosynthesis are about to increase during the summer months?

Darrel conducted an experiment with the following procedure: fill two cups with ice water. place an uninflated balloon snuggly onto your left index finger. blow a little air into an identical balloon, and place it onto your right index finger. place both fingers into the cups of ice water. darrel noticed that his right finger felt warmer in the ice water than did his left finger. which of the following does the experiment show? a. air is a good radiator of heat. b. air is a good insulator of heat. c. air is a good conductor of heat. d. air is a good convector of heat.

Which of the following types of stars is most likely to end up as a supernova? in graph a, the curve peaks at 800 nm, in the red section of the visible light spectrum. in graph b, the curve peaks at 550 nm, in the green section of the visible light spectrum. in graph c, the curve peaks at 450 nm, in the blue section of the visible light spectrum. in graph d, the curve peaks at 300 nm, in the violet section of the visible light spectrum. a b c d

Chloroplasts and bacteria are in size. a. similar b. at different ends of the size range c. exactly the same d. none of these