Hummingbirds need large amounts of energy to flap their wings between 60 and 200 times per second. Their wings beat so rapidly that it is difficult to see them move. They often appear suspended in air for extended periods of time without changing their location. Hummingbirds have long bills and grooved tongues to reach into flowers to feed on flower nectar. They also feed on insects.
The body system most directly interacting with the skeletal system to enable hummingbirds to beat their wings between 60 and 200 times per second is the-
F.
muscular system.
G.
integumentary system.
H.
endocrine system.
J.
circulatory system.
Answers: 2
Biology, 21.06.2019 21:00, dkargbo6034
If water is at -10 ° c and energy is added to the water until it is 50 ° c while maintaining a constant pressure of 760 mmhg, describe the phase change of the water?
Answers: 2
Biology, 22.06.2019 03:50, Jeyson5852
How are gross production and net production different? a. net production is always greater than gross production. b. net production is always less than gross production. only animals have net production. d. only plants have net production. select the best answer from the choices provided
Answers: 1
Biology, 22.06.2019 04:30, Lindsay882
Why are scientists concerned about the depletion of the ozone levels in the stratosphere?
Answers: 2
Hummingbirds need large amounts of energy to flap their wings between 60 and 200 times per second. T...
Mathematics, 22.06.2019 11:20
Biology, 22.06.2019 11:20
Health, 22.06.2019 11:20
Mathematics, 22.06.2019 11:20
Social Studies, 22.06.2019 11:20