The invention of the microscope opened up a new world to scientists. They were now able to see things they never were able to see with the naked eye. What would a
biologist see if she examined a small piece of a leaf from a plant and a small piece of a
root from the same plant through a microscope?
of cells.
A. Both the leaf and the root would be made

B. The leaf would be made up of cells, but the root would not be made up of cells.

C. The root would be made up of cells, but the leaf would not be made up of cells.

D. Neither the root nor the leaf would be made up of cells because plants are not made up of cells.

Consider the model of the oxygen cycle on earth. the majority of earth's oxygen reservoirs are found in the a) atmosphere. b) biosphere. c) hydrosphere. d) lithosphere.

Aresearcher designed an investigation to test what effect eating different types of food would have on blood insulin levels. she selected 10 male subjects who were all 25 years of age and in good health. the experiment took place over 3 days. at 8: 00 a. m. on each day, the subjects ate a meal consisting of only 1 type of food. they had their blood insulin levels measured after consuming the meal. on day 1 they ate a high fat diet, on day 2 they ate a high protein diet, and on day 3 they ate a high sugar diel what is the independent variable in this experiment? a the age of the subjects b the blood insulin level c the type of food consumed d the time of day the meal was consumed

The hematodinium parasite becomes less of a problem for the blue crab when the crab is very young. fishing is thriving in the region. the crab moves to less salty water. a significant percentage of the population is impacted.