Taller trees have a canopy arrangement of leaves where the upper leaves tend to be smaller than the ones below them. how does this arrangement of leaves benefit the plant?

Plz plz plz quick! 49 points for whoever which of the following statements about greenhouse effect is true? *life on earth is suffering because of greenhouse effect *the greenhouse effect is caused by human activity *all greenhouse gases are harmful *life on earth would not exist without the greenhouse effect

Which group of algae is characterized by unicellular organisms and includes some members that would be better classified as zooflagellates? euglenophytes red algae sporozoans green algae

In general, characteristics that an organism survive and reproduce become more common over time. what mechanism of evolution causes this?