3. give two examples of seed plants that have flagellated sperm.

Gingko biloba and ferns are examples of seed plants with flagellated sperms.

Explanation:

Flagellated sperm reminds the origin of life in water and flagellated sperms was an adaptation to enable sperm movement in water. After several phases of evolution flagellated sperm feature is rarely found in plants.

Infact all of the angiosperms and a large population of gymnosperms lack flagellated sperm.  Gingko biloba is a gymnosperm found in China and is the last remaining species of the division Gingkophyta.

It grows up to a height of 20-35 meters and is well known for its medicinal properties. Ferns have flagellated sperm and it is  a sign that ferns have been existing on the earth before many long years.  

1.the evidene of the reaction

2.yes

3.yes

it cools slower in the earth meaning the crystals have more time to form than lava on the surface