Question

This passage describes toad poison resistance in red-bellied black snakes.

a red-bellied black snake
Red-bellied black snakes eat small animals such as toads. One species of toad, called a cane toad, has poisonous skin. When a red-bellied black snake eats a cane toad, the toad's poison may kill the snake.
However, some red-bellied black snakes have a trait called toad poison resistance. These snakes can eat cane toads without dying.
The table below describes a possible population of red-bellied black snakes at the start of a period of time and at the end of that period. The table shows the toad poison resistance trait in the population at each point in time.
Complete the table. Write the exact answers as whole numbers or decimals.
Data about a population of red-bellied black snakes
Point in time Number with toad poison resistance Number without toad poison resistance Percentage with toad poison resistance Percentage without toad poison resistance
Start 189 411
%
%
End 47 53
%
%

Answer 1

To complete the table, we first need to calculate the total number of red-bellied black snakes at the start and at the end of the period, and then use that information to compute the percentages of those with and without toad poison resistance.

### At the Start:
- **Number with toad poison resistance:** 189
- **Number without toad poison resistance:** 411
- **Total number of snakes:** 189 + 411 = 600

Now we can calculate the percentages:
- **Percentage with toad poison resistance:** (189 / 600) * 100 = 31.5%
- **Percentage without toad poison resistance:** (411 / 600) * 100 = 68.5%

### At the End:
- **Number with toad poison resistance:** 47
- **Number without toad poison resistance:** 53
- **Total number of snakes:** 47 + 53 = 100

Now we can calculate the percentages:
- **Percentage with toad poison resistance:** (47 / 100) * 100 = 47%
- **Percentage without toad poison resistance:** (53 / 100) * 100 = 53%

### Completed Table:
| Point in time | Number with toad poison resistance | Number without toad poison resistance | Percentage with toad poison resistance | Percentage without toad poison resistance |
|---------------|------------------------------------|---------------------------------------|----------------------------------------|------------------------------------------|
| Start | 189 | 411 | 31.5% | 68.5% |
| End | 47 | 53 | 47% | 53% |

So the final answers are:
- Start Percentage with toad poison resistance: **31.5**
- Start Percentage without toad poison resistance: **68.5**
- End Percentage with toad poison resistance: **47**
- End Percentage without toad poison resistance: **53**