Hundreds of years ago, which of the following did doctors believe was a major cause of disease? A. Bacteria
B. Leeches
C. All of these
D. Unbalanced humors

What organ systems are working to you cool down after a workout?

Why did mendel use pea plants in his experiments? a. they have no alleles. b. they are haploid organisms. c. they reproduce quickly. d. they are all male.

No plagiarizing ! 6th grade work! easy and 100 compare the parts of a cell and the cell as a whole to another common nonliving system (i.e., a car, a city, describe the parts of a cell and their primary function.