TRY IT Explain the Yea
1974
1980
1984
Again, look at the table. Examine the saturated
thickness levels between 1975 and 1990 and
between 1995 and 2010. Each of these are fifteen-
year spans, but the decrease in saturated
thickness is not the same. Even if the population
were to stay the same Iver this time, why do you
think the drop in thickness is not as great?
1990
1994
200K
2004
2010

Elements and compounds are pure substances that cannot be broken down physically into a simpler substance. a physical change doesn’t break the bonds between atoms of a substance or form new ones. compounds can be broken down by a chemical change. a chemical change breaks chemical bonds and/or forms new ones between atoms of a substance. what simple substance would a compound break into? the basic elements that make it up! for example, if you passed a very strong electric current through water you’d break the chemical bonds in water and be left with oxygen and hydrogen. which of the following is an example of a chemical change? a separating water into different glasses b breaking frozen ice cubes with a hammer c running an electric current through water d boiling water to evaporate it on a stove

Elephants in the savanna regions of africa dig holes in dried up river beds to reach water lying just below the surface. these holes provide drinking water for other animals as well. so, without the elephants, many animals might otherwise die from lack of water during the dry season. the location in which the elephants live is an example of a/n and the role they play in creating water holes is an example of a a) ecosystem; habitat b) community; niche c) habitat; niche d) niche; habitat

Which macromolecule catalyzes chemical reactions this be considered enzyme chemical reactions thus he considering enzymes