The picture shows a diver constructing artificial reef in a shallow area of the ocean. artificial reef is intended to affect the ocean ecosystem by- A. removing pollution from the water
B. Providing shelter for marine organisms
C. Causing sediment to erode into deeper waters
D. Preventing people from overfishing along the shore

Air pressure is measured in pascals. for a professional american football game, the ball should be inflated to about 90,000 pascals. scientists studied the effects of air temperature on the pressure inside american footballs by taking these steps: 1. prepare 100 footballs. 2. measure each football's air pressure. 3. divide footballs into 10 groups. 4. place the groups in different lockers cooled to different air temperatures. 5. after 12 hours, remove the footballs from lockers. 6. measure each football's pressure again. 7. compare the new pressures to the starting pressures. what two terms best describe the variable "air pressure inside the football" in this experiment? independent, qualitative independent, quantitative dependent, qualitative dependent, quantitative

4. glenn andrews recently bought a motorcycle for $3,950. if he had to pay 6% sales tax on the bike, what was the total cost of the motorcycle?

Which compound should undergo substitution of the bromine by phenolate anion? draw the structure of the organic product?