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
prohojiy [21]
3 years ago
6

What is the approximate percent of oxygen by volume present in Earth's lower atmosphere?

Biology
1 answer:
Svetlanka [38]3 years ago
4 0

Answer:  21 percent

Explanation:

According to NASA, the gases in Earth's atmosphere include: Nitrogen — 78 percent. Oxygen — 21 percent. Argon — 0.93 percent.

You might be interested in
My answer is c
arlik [135]
<span>C.
has strong legs for running

</span>
8 0
3 years ago
What two muscles on your muscle list aid in mastication?
Ludmilka [50]
Unfortunately this question is incomplete as no options are provided. IN actual fact,<span> four muscles are involved in mastication. Three of these are responsible for biting down, namely the masseter, the temporalis and the medial pterygoid, whereas one, the lateral pterygoid, is responsible for opening of the jaw</span><span>. All four muscles help to move the jaw laterally.</span>
4 0
3 years ago
Persons with XX at the 23rd pair produce __ and those with XY at the 23rd pair produce __. *
Veseljchak [2.6K]

Answer:

B

Explanation:

XX is female they produce eggs. XY is male. they produce sperm

4 0
3 years ago
Read 2 more answers
A.dog<br> B.math<br> C.penguin<br> D.yeast
erica [24]
The answer is A i think
4 0
3 years ago
Read 2 more answers
which process of cellular respiration generates the most atp when glucios is completely oxidized to oxide​
krek1111 [17]

rickle pick . . . . .

8 0
3 years ago
Other questions:
  • I NEED HELP ASAP (IF IT IS CORRECT THEN ILL MARK BRAINLIEST) which do guard cells control? A. the rate of food production B. mov
    15·2 answers
  • During expiration, the volume of the thorax __________ as the diaphragm __________
    15·1 answer
  • Select the correct answer from each drop-down menu.
    8·1 answer
  • 6. How did the disappearance of dinosaurs help the spread of early mammals?
    9·2 answers
  • A straight line of energy flows is a food web or a food chain?
    11·1 answer
  • What is the basic building block of life
    11·2 answers
  • What is one reason some leaves are spiny or needle shaped
    6·1 answer
  • The release of energy from food ____ _____ is called fermentation.
    13·1 answer
  • ANSWER FAST PLS!
    14·1 answer
  • Which gives nourishment to embryo sac??<br>1) Tapetum<br>2) Endosperm<br>3) Thalamus<br>4)Nucellus​
    10·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!