Majority of the red algae are `"_________"` with greater concentrations found in the `"__________"`.

Options

A. fresh water, colder areas
B. marine, warmer areas
C. marine, colder areas
D. fresh water, warmer areas

Answer

**Step-by-Step Solution:**

1. **Identify the Type of Algae**: The question refers specifically to red algae, which belong to the class Rhodophyceae.

2. **Determine the Habitat**: Red algae are predominantly found in marine environments. This is a key characteristic of this group of algae.

3. **Consider Temperature Preferences**: Within marine environments, red algae are typically found in warmer areas. This is due to their preference for sunlight and warmer water temperatures, which support their growth.

4. **Complete the Sentence**: Based on the information gathered, we can fill in the blanks in the question. The complete statement would read: "Majority of the red algae are **marine** with greater concentrations found in the **warmer areas**."

**Final Answer**: Majority of the red algae are **marine** with greater concentrations found in the **warmer areas**.

---