Why do scientists believe the polar ice is disappearing?

water pollution

global warming

garbage dumping

polar bears are breaking it up

what are the main causes of global warming?

emissions from cars and factories

discharge from water treatment plants

chemicals in the water

hazardous waste buried underground

how do polar bears use ice?

drinking water

food

means of travel

platform for hunting seals

what is one human activity that may be contributing most to melting of the ice?

dumping chemicals in water

driving cars

speeding up soil erosion

mining gold and silver

Mrna decodes information from the original dna master plan to build proteins in the during the process of ribosomes.

Which statements best describe the differences or similarities between a comparative investigation and an experimental investigation? check all that apply. experimental investigations are best for showing cause-and-effect relationships, while comparative investigations do not necessarily show this type of relationship. comparative investigations are often impractical and unrealistic, while experimental investigations are the most practical and realistic kinds of investigations. comparative investigations allow for the use of a wide range of variables but do not have a control group, while experimental investigations involve variables that can be controlled. both experimental investigations and comparative investigations are designed to answer scientific questions. both experimental investigations and comparative investigations focus on making observations rather than collecting new data.

How do temperature and salinity affect deepwater currents? question 15 options: as temperatures and salinity levels of water increase, the water rises to the surface where it creates currents as it moves to colder regions. they create changes in wind direction, moving denser water in the same direction as the wind and causing the deepwater circulation patterns found in the ocean. they equalize the forces on undersea currents caused by the coriolis effect as they replace more dense water with less dense water. they create density differences that cause dense deepwater currents to flow toward the equator where they displace less dense, warmer water above them.