Which of the following is not a parasite?

Options

A. lice
B. leech
C. algae
D. cuscuta

Answer

**Step-by-Step Solution:**

1. **Understand the Definition of Parasites**: Parasites are organisms that obtain their nutrition from other living organisms, known as hosts. They cannot synthesize their own food and are typically not green in color.

2. **Identify the Organisms Given**: The options provided are lice, leech, LG, and cascuita. We need to analyze each one to determine which is not a parasite.

3. **Analyze Each Organism**:
- **Lice**: Lice are parasites that feed on the blood of their hosts (usually humans or animals).
- **Leech**: Leeches are also parasites that attach to their hosts and feed on their blood.
- **Cascuita**: Cascuita is a type of plant parasite that derives nutrients from other plants.
- **LG**: LG is an autotroph, meaning it can synthesize its own food through photosynthesis.

4. **Determine Which is Not a Parasite**: Since LG can produce its own food and does not rely on other organisms for nutrition, it is not a parasite.

5. **Conclusion**: The organism that is not a parasite among the options given is LG.

**Final Answer**: LG is not a parasite.

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