Which group of organisms is an example of a population?
-Leopard frogs in a stream
-birds in Colorado
-reptiles in the Sahara Desert
-trees in a forest
Which is the correct hierarchy of life from simple to complex?
-organism ¨ organ system ¨ organ ¨ tissue ¨ cell
-bacteria ¨ cell ¨ tissue ¨ organ ¨ organ system
-cell ¨ tissue ¨ organ ¨ organ system ¨ organism
-DNA ¨ cell ¨ organ ¨ organ system ¨ organism
A student plans to conduct an experiment to determine how a change in the pH of water affects the population growth rate of algae. To ensure that her experimental data are valid, she should ?
-control the final algae population sizes
-hold the acidity of the water constant
-use the same species of algae in all trials
-vary the temperature of the water used
A scientist performs an experiment to see if acids have an effect on the health of a
particular type of plant. Three sets of plants were treated with acidic solutions of known
pH while the control set was treated with a solution of neutral pH 7.
Results: pH2: 10 plants dead; pH 4: 3 plants dead; pH 6: 1 dead
pH 7: 0 Dead
Which is the best conclusion for this experiment?
-High acidity is helpful to this type of plant.
-Low acidity is harmful to this type of plant.
-High acidity is harmful to this type of plant.
-Acid has no effect on the health of this type of plant.
In the late 1800s, a scientist studies a disease called beriberi, which is caused by a vitamin deficiency. A disease similar to beriberi occurred in chickens that were fed polished rice, which is rice that has had the bran layer removed. Chickens that ate unpolished rice did not get the disease. The scientist convinced officials of a prison experiencing an outbreak of the disease to start feeding the prisoners unpolished rice.
The rate of beriberi decreased dramatically. Which procedure would best convince other scientists who questions his results?
-Provide the same number of prisoners with polished rice as with unpolished rice.
-Feed prisoners chickens that ate only unpolished rice.
-study other types of animals that had a disease similar to beriberi.
-compare chickens that ate polished rice to prisoners who ate polished rice
A person sweating on a hot day would most likely be an example of what biological process?
Thank you so much! I appreciate any answers. I am curious about some things in biology. 10 points!