1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
kobusy [5.1K]
3 years ago
8

8. Humans need oxygen to break down food in order to provide energy for cells. The oxygen needed for this process is delivered b

y an organ system called the A. respiratory system. B. lungs. C. digestive system. D. alveolus.
Physics
2 answers:
Marina86 [1]3 years ago
7 0

Answer:

The answer is B. Lungs

Aleonysh [2.5K]3 years ago
7 0

Answer: B

Explanation: we use lungs to breathe, so we take oxygen by lungs.  

You might be interested in
To halt the decline in biodiversity, we must do which of the following?
emmainna [20.7K]
<span>adopt ecological conservation practices </span>
6 0
3 years ago
what were the negative results with the american television from analog broadcast to digital broadcast?
alexandr1967 [171]

Answer:

Explanation:

everything

8 0
3 years ago
Read 2 more answers
For her birthday, amy received flowers that had a dull red appearance. compared with the entire range of visible light waves, th
Cerrena [4.2K]
The flowers reflect relatively low frequency and low amplitude light waves.
White light contains a spectrum of colors, and red light is at the beginning of this spectrum in terms of energy. This means that it has the lowest frequency, as the energy of a wave of light is directly proportional to its frequency.
The amplitude of a light wave gives a measure of how intense the light is. A dull light means that the amplitude of the wave is low.
4 0
3 years ago
Galileo's observational contributionsGalileo Galilei was the first scientist to perform experiments in order to test his ideas.
ozzi
<h2>Answer: </h2><h2>- Jupiter has orbiting moons.</h2><h2>- The Sun has sunspots and rotates on its axis.</h2><h2>- The Moon has mountains, valleys, and craters.</h2><h2>- Venus goes through a full set of phases.</h2>

Explanation:

In 1609 Galileo built a telescope, with which he observed mountains and craters on the Moon, discovered Jupiter’s major satellites and the next year he published these discoveries in his book <em>The Sidereal Messenger</em>.

In addition, Galileo observed that Venus presented phases (such as those of the moon) together with a variation in size; observations that are only compatible with the fact that Venus rotates around the Sun and not around Earth. This is because <u>Venus presented its smaller size when it was in full phase and the largest size when it was in the new one, when it is between the Sun and the Earth.  </u>

<u />

On the other hand, <u>although Galileo was not the first to observe sunspots</u>, he gave the correct explanation of their existence, which supported the idea that planets revolve around the Sun.

These observations and discoveries were presented by Galileo to the Catholic Church (which supported the geocentric theory at that time) as a proof that completely refuted Ptolemy's geocentric system and affirmed Copernicus' heliocentric theory.

4 0
3 years ago
Help please
Anarel [89]

Answer:

1) D, 2) D, 3) B, 4) B, 5) C

Explanation:

You are asked to select the correct answer

1)  The conservation of energy is one of the most important principles of physics that allows solving countless problems in life.

the correct answer is D

2) when a body falls, the gravitational potential energy is transformed into kinetic energy and both are transformed into thermal energy

the correct answer is D

3) When the gravitational potential energy is maximum, the kinetic energy is minimum and when the kinetic energy is maximum, the gravitational energy is minimum.

Correct answer B

4) speed is defined by

         v = x / t

so the correct answer is B in the SI system

5) when we repeat a measurement several times, the random or statistical errors decrease, therefore the confidence of the measurement increases.

The correct answer is C

4 0
3 years ago
Other questions:
  • A race car is one lap behind the lead race car when the lead car has 44 laps to go in a race. If the speed of the lead car is 55
    15·1 answer
  • With a frequency of 500 hz, what is the period of a wave
    9·1 answer
  • An object is formed by attaching a uniform, thin rod with a mass of mr = 6.9 kg and length L = 4.88 m to a uniform sphere with m
    6·1 answer
  • Identify the role of each organism in the food chain.
    9·2 answers
  • Please help! I especially need help with the second question but help with the first one would be most appreciated!
    5·1 answer
  • An engineer is adding a heat sink to a motor to help absorb some of the heat produced by the motor. Which piece of metal would a
    11·2 answers
  • Ask Your Teacher In a choir practice room, two parallel walls are 4.00 m apart. The singers stand against the north wall. The or
    8·1 answer
  • A jogger runs 6 km north ,5 km east then another 4km north her average speed 8 km how long will it take her to complete her run
    13·1 answer
  • Use the table to answer the question.
    8·1 answer
  • What are the types of waves
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!