What are seaweeds? What are the classifications of seaweeds? ...

[lindiwe]

What are seaweeds? What are the classifications of seaweeds?

Question 2

The primary forces that cause tides in the sea are ____.
 A) coastal earthquakes and landslides
  B) wind and storms at sea
  C) the gravitational attraction of the moon and the sun
  D) the gravitational attraction of Mars and Venus

[mceravolo]

Answer to Question 1

 Seaweeds are nonvascular, photosynthetic organisms. They are a type of algae. They share similar structures to leaves, stems, and roots. Many thrive in temperature, nutrient-rich waters.
 There are two categories of seaweedsphaeophytes and rhodophytes. They are classified by their accessory pigments.
 Phaeophytes are brown algae. Nearly all living species are marine. These include the largest of algae, kelp. Some of the phaeophytes are seasonal. Some are able to grow in water 35 meters deep. Phaeophytes dominate in temperate and subpolar regions.
 Rhodophytes are red algae. This classification group contains most species of seaweeds. There are more rhodophyte species than other algae groups combined.

Answer to Question 2

C