Name the group of the plant which is diploid and well adapted to extreme conditions. It grows bearing sporophylls in compact structures called cones.

Explanation

To answer the question about the group of plants that is diploid, well adapted to extreme conditions, and grows bearing sporophylls in compact structures called cones, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Diploid**:
- The term "diploid" refers to organisms that have two sets of chromosomes, denoted as 2n. This means that the organism has pairs of chromosomes, one from each parent.

**Hint**: Remember that diploid organisms have two sets of chromosomes, which is a key characteristic of many plant groups.
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