Which molecule contributes to the greenhouse effect? A. Oxygen gas
B. Methane gas
C. Nitrogen gas
o o
D. Helium gas

How does the study of genetic disorders such as pku biologists understand normal alleles?

Why was mendel's work not accepted at the time? o a. his results were false. o b. he did not repeat his experiments. o c. he did not have any data. o d. his results were surprising,

Which of the following describes a difference when gram-positive bacteria are compared to gram-negative bacteria?