What is the average velocity of a car that travels 450 km north in 9.0 hours?

Describe different biomes. what are some adaptations that organisms (plants or animals) must have to live in each biome?

Which of the following is a characteristic shared by both electron and light microscopes? a. they both employ the use of objective lenses. b. both microscopes require an internal camera to visualize the specimen. c. both microscopes have a resolving power of 0.01 nm. d. they both utilize white light to magnify the specimen.

Four friends, a, b, c, and d are standing varying distances away from a speaker which is producing sound waves.