Respuesta :

The possible answers are
1)Abiotic factors in their habitat only
2)Abiotic factors in their habitat and surrounding habitats
3)Biotic factors such as possible predators only
4)Both abiotic and biotic factors in their ecosystem

The correct answer is 4.
When a population of an organism is showing a decline, we should investigate both abiotic and biotic factors that could contribute to the decline.
Abiotic factors can be temperature, different level of nutrients etc. and the biotic factors include trophic interactions in the ecosystem. 

1. What is a biotic factor? (2 points)

An organism that is or was living

2. Which of the following is an example of a biotic factor? (2 points)

The shrimp population in a bay

3. A population of jellyfish has shown a sharp decline. What types of factors should be investigated? (2 points)

Both abiotic and biotic factors in their ecosystem

4. Which of the following abiotic factors affects the ocean by providing substances that an organism obtains from its environment in order to grow and live? (2 points)

Nutrients

5. A housing development is situated near a river that flows into a bay. Which of the following is an abiotic factor on land that would directly affect the marine ecosystem in the bay? (2 points)

The amount of fertilizer runoff coming from lawns