Ineed with five multiple choice marine science questions.
1)when severe weather damages the plant life in an ecosystem, what effects might this have on other organisms in the same ecosystem?
a)- other organisms could starve or have to leave the area if they depend on the plants as food.
b) -other organisms could change their behavior to take the place of the plants in the ecosystem.
c )-other organisms would not be affected.
d )-other organisms could replace the plant energy with radiant energy from the sun.
2)as the climate changes, the average ocean temperature is rising. using this information, predict what will most likely happen to el niño events in the future.
a)-el niño events will intensify because they rely on warmer water sinking to the seafloor.
b)-el niño events will intensify because they will build on the already warm waters at the equator.
c)-some el niño events will be stronger, but most will be weaker because the ocean currents are unpredictable.
d)-el niño events will become more similar to la niña events and establish a new weather pattern.
3)which of the following examples is the most likely way severe weather can negatively affect the biodiversity of a marine ecosystem?
a)-a severe thunderstorm brings rain and wind to an intertidal zone.
b)-a storm surge from a hurricane floods a coastal area.
c)-a tornado causes a waterspout.
d)-a blizzard adds snow and ice to an arctic glacier.
4)el niño events are characterized by warmer than normal ocean temperatures near the equator in the pacific ocean. which weather events are most likely to occur as a result?
a)- increased rainfall across the eastern pacific ocean
b)-decreased flooding across the eastern pacific ocean
c)-drought along the south american pacific coastline
d)-colder winter along the south american pacific coastline
5)according to the severe weather activity worksheet, el niño events most likely occurred during which of the following years?
a)-2006 and 2015
b)-1997, 2006, and 2015
c)-1997 and 2015
d)-1997 and 2006

The eruption of a nearby volcano causes a prairie ecosystem to receive a lot less sunlight. which of these is the most likely effect on the ecosystem? a-an increase in biodiversity. b-an increase in immigration to the area. c-a decrease in available water. d-a decrease in plant growth.

Explain why phospholipid molecules form a bilayer. (3 marks)

Experiments in environmental toxicology can sometimes be manipulative experiments in which the researcher actively chooses and manipulates the independent variable. in hunt's study, for example, dosages of bpa were manipulated and the effects were measured. in manipulative studies, the researcher controls all the other variables in the experiment, so any health effects observed in the test subjects can be attributed to differences in the independent variable. in other cases, researchers use natural experiments in which the dependent variable (typically a measure of organism health) is measured under differing contexts that are not manipulated. say, for example, that an accidental chemical spill contaminates five ponds. to determine the possible effects of the toxic chemical on frogs, a researcher could compare the hatching rate of frog eggs laid in those five ponds to the hatching rate of eggs laid in five uncontaminated ponds nearby. this would be an example of a natural experiment because concentrations of the toxic chemical in the ponds were not controlled by the experimenter, but rather resulted from the chemical spill. drag type of experiment on the left to the example of experiment on the right. blood concentrations of bpa in college students are compared to their recent manipulative consumption of canned food items 2. the feeding behavior of fish in streams that receive acidic runoff from strip mines is compared to the feeding behavior of fish in unaffected streams. the deformity rate in baby birds from nests in pesticide-sprayed fields is compared to the deformity rate in birds from nests in unsprayed fields 4 tumor development is compared in mice exposed to five dosages of a known carcinogen in the laboratory foraging activity levels are compared in tadpoles exposed to four concentrations of toxic metals in the laboratory. growth of corn plants is compared in field plots sprayed with three different dosage: s of weed killer 7 bpa concentrations in the urine of people with diabetes are compared to bpa concentrations in the urine of people without diabetes - natural; manipulative