Currently, there are 100 plants in age class 0, 50 plants in age class 1, 25 plants in age class 2, and 10 plants in age class 3. Based on previous work, you know that the expected survival rates are S0=0.4, S1=0.6, S2=0.8, and S3=0. Fecundities are F0=0, F1=0, F2=10, F3=5. What is the expected total population size two generations later? [medium]

Icant be totally sure but i would say with confidence that it is example #1 about cells.

In some developing nations the percentage of the animal protein from fish in the diet can be as high as 25 percent.  about 85% of fish caught is used for human consumption.  the remainder is converted into fishmeal and fish oil. 

The  pelagic  region is divided into three zones. the top zone is the euphotic or sunlit zone. this is the ocean zone that sunlight penetrates. because this zone gets sunlight, photosynthesis can occur and plants can grow here.sub  zones. the oceanic zone is subdivided into the epipelagic,  mesopelagic, and bathypelagic zones. the epipelagic (euphotic) zone, also called the sunlit zone, receives enough sunlight to support photosynthesis.your question does not include multiple choice,but i can give you some info on what the 3 zones hope this : -)