A plant is placed in sunlight. The plant has one leaf marked A and one leaf marked B. Leaf A is covered with aluminum foil but leaf B is not. After five days, both leaves are removed from the plant. The amount of starch present in leaf A is compared to the amount of starch in leaf B. Which hypothesis is being tested in this investigation?Answer options with 4 optionsA. Food production in plants depends on the absorbtion of light by leaves. B.Food production in plants depends on the availability of oxygen and minerals. C.Food production in plants depends on the availability of carbon dioxide to leaves. D.Food production in plants depends on the level of water in the pot sensed by leaves.

Arunner is jogging at a steady 3.6 km/hr. when the runner is 2.9 km from the finish line, a bird begins flying from the runner to the finish line at 14.4 km/hr (4 times as fast as the runner). when the bird reaches the finish line, it turns around and flies back to the runner. even though the bird is a dodo, we will assume that it occupies only one point in space, i.e., a zero-length bird. how far does the bird travel? (b) after this first encounter, the bird then turns around and flies from the runner back to the finish line, turns around again and flies back to the runner. the bird repeats the back and forth trips until the runner reaches the finish line. how far does the bird travel from the beginning? (i.e. include the distance traveled to the first encounter)

Select all the correct answers. which three statements about electromagnetic radiation are true?

Awave with a frequency of 500 hz is traveling at a speed of 100 m/s.what is the wavelength?