Select the animal whose absence would have the greatest negative effect on the ecosystem.

Answer 1

It is difficult to definitively say which animal's absence would have the greatest negative effect on an ecosystem without knowing the specific ecosystem in question. However, some key species that are often considered to have a major impact on their ecosystems include:

1. Keystone species such as predators like wolves or top predators like sharks. These species play a critical role in maintaining the balance of their ecosystems by controlling populations of prey species.

2. Pollinators such as bees, butterflies, and birds. These animals are essential for the reproduction of many plant species, including crops that humans rely on for food.

3. Decomposers such as fungi and bacteria. These organisms break down dead organic matter and recycle nutrients in the ecosystem, which is essential for the survival of other plants and animals.

Overall, the absence of any of these key species could have significant negative effects on an ecosystem's health and stability.