2. Вставьте предлоги: 1) The gymnosperms are divided seven orders.
2) Hardwoods are included ___ the class called angiosperms.
3) Trees are referred ___ most precisely scientific names.

1) The gymnosperms are divided into seven orders.

Explanation: When referring to the act of dividing the gymnosperms, we use the preposition "into" to indicate that they are being divided into separate categories or groups. In this case, they are being divided into seven orders.

2) Hardwoods are included in the class called angiosperms.

Explanation: The preposition "in" is used to show that hardwoods are part of or belong to the class called angiosperms. In other words, they are included within this specific classification.

3) Trees are referred to by most precisely scientific names.

Explanation: The preposition "to" is used to indicate that trees are referred to or identified by their scientific names. It shows the relationship between the subject (trees) and the action of referring or identifying them.