Which group does this plant belongs to?
1. Mosses
2. Ferns
3. Conifers
and why?

Explanation:

Mosses ; bryophytes

Traditionally, mosses were grouped with the liverworts and hornworts in the division Bryophyta (bryophytes, or Bryophyta sensu lato), within which the mosses made up the class Musci.

Ferns ; pteridophytes

Ferns are a group of about 20,000 species of plants (of which about 10,000 are living) in the division Pteridophyta. .

Conifers ; gymnosperms

Conifer is the common name for the division of gymnosperms known as Pinophyta.

sex cells are usually half's then they find another half and make a fertilize egg