Some people have proposed trying to artificially change the chemistry of seawater to make it more alkaline. What problem are they trying to address? Most organisms survive well in a highly alkaline environment, so changing the ocean's chemistry would increase our food supply. Coral reefs require an alkaline environment or they lose their zooxanthellae and become white. The ocean needs to be more alkaline so that the coral reefs can dissolve naturally to repeat the cycle of breakdown and renewal. The ocean has become increasingly acidified as it takes up CO2, harming living organisms such as coral reefs. There are too many fish in the ocean and making it more alkaline would make the numbers more manageable.

Which property is illustrated in the following examples? A bacterium makes a copy of itself, increasing population numbers. _____________ A baby penguin changes as it ages, starting out as a fluffy bird and maturing into a sleek animal. ________________________ The body cools itself by sweating when its internal temperature rises. _______________ It’s cold, so I put on a sweater. _________________________

Above is trehalose dimycolate, a lipid that allows the bacteria that cause tuberculosis to spread throughout the lung. What is the best way to classify this molecule? :positively charged :mostly hydrophobic :negatively charged :polar :hydrophilic

Imagine a chemical spills into a lake. At levels of 10 part per 1000, this chemical causes reduced fertility in Rainbow Trout (a type of fish), and at 20 parts in 1000 it is lethal to Rainbow Trout. It is not toxic for fish in water at the concentration present at the time of the spill, but it will biomagnify in the invertebrate prey that trout feed on. The table below shows the concentration of the chemical in the invertebrates in the years after the spill. Year after spill Chemical concentration in invertebrates (parts per 1000) 0 1 2 1 5 7 10 18 20 21 3 4 5 6 Based on this information, answer the following questions. a. In what year following the spill will the birth rate of trout decrease? b. In what year will the mortality rate of the trout increase? C.