Birds and Fishes Overcome Gravitational Forces Primarily Through Their ________

Question

Birds and fishes overcome gravitational forces primarily through their ________.  
A) body shape and density
B) lubricating secretions
C) smooth outer covering
D) textured surface
E) reduced surface area in contact with the ground

Accepted Answer

Birds and fishes have adapted to their environment by developing body shapes that reduce their density, allowing them to overcome gravitational forces and move through air or water with ease. Their streamlined body shape also reduces their surface area, which helps to reduce drag and further conserve energy while in motion. Lubricating secretions, smooth outer coverings, and textured surfaces are not primarily responsible for helping birds and fishes overcome gravitational forces.