2. on which date does the antarctic circle have 24 hours of daylight? (1 point)june 21 march 21 september 21 december 21 3. when energy is transferred to air, what happens to the particles of air? (1 point)they move slower. they move faster. they cool down. none of the above

Flock x flock y flock z total pieces of food eaten (from previous page) 147 93 60 food percentage* % % % simulated number of birds in flock for 3rd generation** * divide each flock's total pieces of food by 300, the total number of pieces of food eaten. ** multiply the food percentage for each flock by the total number of birds (30).

Match the examples to the correct level of organization. 1. system level roses, snakes, puppies 2. organism level roots, stamens, leaves 3. tissue level bone, cartilage, blood 4. organ level heart, veins, arteries

Acceleration is a direct result of a.) balanced forces b.) unbalanced forces c.) gravity d.) velocity