Why might a Punnett square predicting the results of a dihybrid cross give incorrect results?

a. The two genes are on the same chromosome, making some combinations less likely than others.
b. The two genes are on the same chromosome, making some combinations more likely than others.
c. The two genes are not on the same chromosome, making some combinations more likely than others.
d. The two genes are not on the same chromosome, making some combinations less likely than others.

Researchers randomly divide participants into groups. each group takes a different amount of omega-3 fatty acid supplements daily for a month. one group receives a placebo. the researchers measure the impact on cholesterol levels in the blood. what is the purpose of random assignment in this experiment? a, to produce treatment groups with similar characteristics b, to ensure that all people with high cholesterol have an equal chance of being selected for the study c, to increase the accuracy of the research results and prevent skewness in the data

There are specialized producers that live in warm water vents deep in the ocean. these producers do not per-form from photosynthesis, but instead perform a similar process with iron and other chemicals. why do you think these producers use this process instead of photosynthesis?

Ascientific idea becomes valid when it is what?