Question

This passage describes dioxin tolerance in Atlantic killifish.

an Atlantic killifish
Atlantic killifish are small fish. Some Atlantic killifish may live in water that is polluted with dioxins. Dioxins (dye-AHK-sins) are toxic chemicals that can be created by burning certain materials, including plastics commonly found in trash. To survive in water with dioxins, an Atlantic killifish must have a trait called dioxin tolerance.
The table below describes a possible population of Atlantic killifish at the start of a period of time and at the end of that period. The table shows the dioxin tolerance trait in the population at each point in time.
Complete the table.
Data about a population of Atlantic killifish
Point in time Number with dioxin tolerance Number without dioxin tolerance Percentage with dioxin tolerance Percentage without dioxin tolerance
Start 664 136
%
%
End 57 43
%
%

Answer 1

To complete the table, we will first calculate the total number of Atlantic killifish at both the start and the end, then we will calculate the percentages of those with and without dioxin tolerance.

### Start:
- **Number with dioxin tolerance**: 664
- **Number without dioxin tolerance**: 136
- **Total** = 664 + 136 = 800

**Percentage with dioxin tolerance**:
\[
\text{Percentage with dioxin tolerance} = \left( \frac{664}{800} \right) \times 100 = 83\%
\]

**Percentage without dioxin tolerance**:
\[
\text{Percentage without dioxin tolerance} = \left( \frac{136}{800} \right) \times 100 = 17\%
\]

### End:
- **Number with dioxin tolerance**: 57
- **Number without dioxin tolerance**: 43
- **Total** = 57 + 43 = 100

**Percentage with dioxin tolerance**:
\[
\text{Percentage with dioxin tolerance} = \left( \frac{57}{100} \right) \times 100 = 57\%
\]

**Percentage without dioxin tolerance**:
\[
\text{Percentage without dioxin tolerance} = \left( \frac{43}{100} \right) \times 100 = 43\%
\]

### Completed Table:

| Point in time | Number with dioxin tolerance | Number without dioxin tolerance | Percentage with dioxin tolerance | Percentage without dioxin tolerance |
|---------------|------------------------------|---------------------------------|----------------------------------|------------------------------------|
| Start | 664 | 136 | 83% | 17% |
| End | 57 | 43 | 57% | 43% |