_________ are often referred to as the amphibians of the plant kingdom.

Bryophyta

The correct answer is Option (3)- Bryophyta

Bryophyta are often referred to as the amphibians of the plant kingdom.

Explanation:

• Bryophytes, which include mosses, liverworts, and hornworts, are non-vascular plants.
• They are called the amphibians of the plant kingdom because they share certain characteristics with amphibians (animals) in terms of their dependence on water for reproduction.
• Bryophytes require water for the transport of sperm to reach the egg during the fertilization process.

So, the correct answer is Bryophyta.