Which statement about bird flight is true?
A) Birds must be within a thermal in order to fly.
B) Small birds such as sparrows spend most of their time soaring.
C) Bird wings are airfoils that cause air to flow faster under the wing than over the wing.
D) In order for birds to stay in the air, lift must balance gravity.
D
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Briefly explain why desert ecosystems are particularly fragile.
What will be an ideal response?
Why is heat often added to chemical reactions performed in the laboratory?
A. to increase the rate at which reactant collide B. to allow a greater number of reactants to pass over the activation energy C. to compensate for the natural tendency of energy to disperse D. all of the above
Genetic variation among individuals of the same species enables some of these individuals to have a greater chance of obtaining resources and therefore, producing more offspring.
Answer the following statement true (T) or false (F)
Most earthquakes occur along ________ plate boundaries
Use one of the following five terms to fill in the blanks for the questions below: Continental crust, Asthenosphere, Mantle, Lithosphere, Oceanic crust Fill in the blank(s) with correct word