What are four places a scientist can go to find information about a problem

Ascientist is conducting an investigation that involves water, silver, carbon dioxide, and oxygen gas which group of statements best describes all of the materials he is using in the investigation?

The “ecological footprint” left by a citizen of a developed nation is about four times larger than that left by a citizen of a developing nation. why is this the case?

What are some of the immune functions of the lymphatic system? a. cleaning red blood cells from the blood and creating lymph fluids b. transporting lymph to the tissues and creating lymph fluids c. removing infectious agents and making white blood cells d. making red blood cells and removing infectious agents