Why Have Biologists Hypothesized That the First Land Plants Had

question 15

Multiple Choice

Why have biologists hypothesized that the first land plants had a low, sprawling growth habit?

• A) Only fossilized plants exhibit this habit.
• B) The ancestors of land plants, green algae, lack the structural support to stand erect in air.
• C) At the time of the first land plants, the atmosphere had oxygen mainly close to the ground.
• D) Land animals of that period consumed erect plants.
• E) Land animals of that period were small, so they needed short plants to eat.

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Definitions:

Shoes

Footwear items designed to protect and comfort human feet while offering support for various activities.

Lungs

Paired respiratory organs situated within the thorax of mammals and many other organisms, essential for breathing and exchanging oxygen and carbon dioxide.

Heart

A muscular organ in most animals, which pumps blood through the circulatory system by rhythmic contraction and dilation.

Tonsils

Lymphoid tissues located in the pharynx that play a role in protecting the body from respiratory and gastrointestinal infections.