To test the effectiveness of plant fertilizer, groups of plants are grown with different types of fertilizer. A control group of
plants would
A not be given any fertilizer.
B
be grown with a mixture of all the fertilizers.
C
not be needed unless the results were unclear.
D
be grown in a different location from the other groups.

In german cockroaches, curved wing (cv) is recessive to normal wing (cv+). bill, who is raising cockroaches in his dorm room, finds that the frequency of the gene for curved wings in his cockroach population is 0.6. in his friend joe’s apartment, the frequency of the gene for curved wings is 0.2. one day joe visits bill in his dorm room, and several cockroaches jump out of joe’s hair and join the population in bill’s room. bill estimates that, now, 10% of the cockroaches in his dorm room are individual roaches that jumped out of joe’s hair. what is the new frequency of curved wings among cockroaches in bill’s room? 0.69 0.4 0.5 0.31 0.20

Why are common names a problem for scientist?

What organ is the first to receive nutrients that have been absorbed from the digestive tract?