Yersinia pestis, the organism that causes the bubonic plague, led to the deaths of approximately 75 million people is the 1300's. This was known as the Black Death. Which type of organism caused the bubonic plague?

A) bacteria
B) fungus
C) protozoa
D) virus

In general, how long does it take to accomplish a long-term goal? a.a few days to a weekb.a few weeks to a monthc.a few months to a yeard. more than a year

Ascientist wants to determine the effect of a new type of gasoline. he fillsone car with normal gasoline and another identical car with the new gasoline.which is the control group? a. the new type of gasolineb. the car with the normal gasolinec. the car with the new gasolinethe amount of gasoline usedd. the amount of gasoline used

Deer cave cannot support photosynthesis is as not enough sunlight is present. in spite of this, it still has a complex food chain. what is the energy foundation of this food chain?