Which factor distinguishes the experimental group from the controlled group?

1. a variable

2. a conclusion

3. a hypothesis

4. a theory

In Beadle and Tatum's auxotroph experiments, the arginine auxotrophs that had a mutation in the arg3 gene required the addition of what compound to grow?

Lichens represent a symbiotic relationship between A. algae and fungi. B. fungi and rocks. C. animal-like protists and plant-like protists. D. euglena and nitrogen-fixing bacteria.

The auditory, or eustachian, tube extends from the nasopharynx to theA external ear. B middle ear. C inner ear. D oropharynx.

Explain 5 ways in which microorganism are important in agriculture?

A cell preparing to undergo meiosis duplicates its chromosomes during

Why are some planets made of frozen gases and others solid?

The skin is the primary organ of the

What is true for urochordates? A. The notochord is present throughout their lives. B. The notochord is present only in the larval stage; it is absent in adults. C. The notochord is present in the larval stage; it becomes vertebrae in adults.

What term is used to refer to a characteristic of a population in statistics?

Which mechanism of ion uptake would best enable a plant to produce a steady supply of chlorophyll?