During the past two decades, over 25% of the beluga whales in canada's st. lawrence seaway have died of cancer. biologists speculate that these deaths are caused by polycyclic aromatic hydrocarbon pollutants. these cause
a. oxidation of g to form an a
b. methylation of c to form a t
c. double strand breaks
d. pyrimidine dimers
e. g to t transversion mutations

Plants are used for so many things. in your house alone, you can probably look around you and see where plants have been used. for this project, you will identify various uses of plants in your home. directions make a list of objects, products, and any other items around your house where plants were involved in the production of the item. you should have a list of at least twenty items. then respond to the following questions: note: your list of objects and the answers following should be at least 200 words in length. what if plants no longer existed on earth? how would your life be different?

How does natural selection change thephenotypes within a population over time?

The cluster of developing cells from conception until birth is called an