Question

______Humans release carbon dioxide that plants need; plants provide oxygen that humans need.

______Tapeworms enter a human’s intestines through contaminated water and steal nutrients from the human.

______Remora sharks attach themselves to whales by way of an adhesive disk on their dorsal surface. They then feed on the scraps from the whale’s meals.

Answer 1

The statements you've provided describe different types of ecological relationships between organisms. Here's a breakdown of each relationship:

1. **Mutualism**: The first statement describes a mutualistic relationship where humans and plants benefit from each other. Humans release carbon dioxide, which plants use for photosynthesis, while plants produce oxygen, which humans need for respiration.

2. **Parasitism**: The second statement illustrates a parasitic relationship. Tapeworms benefit at the expense of humans by entering their intestines and consuming nutrients, which can lead to nutrient deficiencies in the human host.

3. **Commensalism**: The third statement represents a commensal relationship. Remora sharks attach themselves to whales and benefit from the leftover food, while the whales are generally unaffected by the presence of the remoras.

To summarize:
- **Mutualism**: Humans and plants
- **Parasitism**: Tapeworms and humans
- **Commensalism**: Remora sharks and whales