When scientists first studied electromagnetic energy, many theories were proposed to explain how these waves travel through space. Which statement below best describes how scientists arrived at the current understanding of electromagnetic energy? A. Scientists all agreed with a single researcher who proposed the current theory.

B. Scientists completed internet searches of all available data to arrive at the current theory.

C. Scientists debated the theories with each other and compared the theories with scientific observations.

D. Scientists were able to observe the light from the brightest star in space, which verified the current theory.

Acommon kind of mechanical weathering is called

Refer to this portion of a dichotomous key for fish identification to answer the question. 1. (a) has a single dorsal fin ® 5 (b) has a double dorsal fin ® 2 2. (a) one fin is spiny, the other is smooth ® 3 (b) one fin is not spiny or smooth ® 4 5. (a) has small fin on back near tail ® 6 (b) has no fin on back near tail ® 7 6. (a) has barbs near the mouth ® catfish (b) does not have barbs near the mouth ® 10 7. (a) tail is asymmetrical ® 8 (b) tail is symmetrical ® 9 10. (a) scales are small ® trout (b) scales are large ® whitefish what is the next step to complete to identify a fish that has a single dorsal fin, no fin on the back near the tail, and no barbs near the mouth? step 2 step 5 step 7 step 10

Which substance contains thylakoids? a) nadph b)atp c)stroma d)chloroplast