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
choli [55]
3 years ago
6

How often does oxygen cycle through the atmosphere?

Biology
2 answers:
erica [24]3 years ago
5 0
About every 2000 years.

Kay [80]3 years ago
4 0

B. about every 2000 years


You might be interested in
Membrane proteins are not soluble in water solutions. To purify and crystallize membrane proteins, the proteins need to be disso
katrin2010 [14]

Answer:

Detergents are knows as a class of molecules whose having unique properties to enable formation of hydrophobic-hydrophilic interaction among molecules in membrane. This unique property of detergents are used to dissolve membrane protein in water solution or in any solution.

Detergents are used to lyse cells, solubilize membrane lipids, and proteins, prevent protein crystalization, and nonspecific binding.

7 0
3 years ago
What substance acts to prevent sudden pH changes in bodliy fluids?
kari74 [83]
Answer:
Buffer

(a brainliest would be appreciated)
5 0
3 years ago
Read 2 more answers
Convert 21.0 cm to inches. Show your dimensional analysis setup
BigorU [14]
<span>cm x (in/cm) = in
21 cm x (1 in / 2.54 cm) = 8.3677 in </span>
3 0
3 years ago
If 1000 f2 offspring are obtained, how many flies of each phenotype are expected?
aniked [119]
<span>In Drosophila + indicates wild-type allele for any gene, m is mahogany and e is ebony. Female parents are m+/m+ and males are +e/+e. F1 are m+/+e, all wild type. F1 females are crossed with me/me males - the test cross. Offspring will be : non recombinant m+/me, mahogany wild type or +e/me wild type ebony. OR recombinant me/me mahogany ebony or ++/++ wild type. As the two genes are 25 map units apart, the percentage of recombinants will be 25% and therefore percentage parental types will be 75%. 75% 1000 is 750. There are two parental types, so you would expect 375 of each. Therefore, you would expect 375 m+/me and 375 +e/me. 25% of 1000 is 250 split between two recombinants =125 of each. Therefore you would expect 135 me/me and 125 ++/++</span>
7 0
4 years ago
The double bond between two oxygen atoms (a molecule of oxygen air) has two characteristics. What are they?
Sholpan [36]
D.Four valence electrons are shared
7 0
3 years ago
Read 2 more answers
Other questions:
  • The concept that living cells only arise from preexisting living cells is called:
    14·1 answer
  • e) Is this is a silent mutation or a missense mutation? Explain. Hint: Silent mutations have no effect on the amino acid. I RLY
    6·1 answer
  • The nucleolus is where _______ are constructed.
    10·2 answers
  • The ears are ___ to the nose. anterior lateral medial prone
    6·2 answers
  • What is a potential negative consequence of using genetically engineered medicine
    11·2 answers
  • O hipotálamo produz 2 hormônios: ocitocina, que estimula a contração do útero no parto e estimula a liberação do leite marterno;
    5·1 answer
  • When Charles Darwin considered some of the unique structures found in modern animals, like the feathered wings of birds, he famo
    9·1 answer
  • Choose the correct level of organization (smallest to largest) in the skeletal system. *
    7·2 answers
  • Please help! Cells inside the body work to keep the dog's temperature stable. True or False?​
    6·2 answers
  • I am having trouble with 1 and 3 so could someone kindly help me? Please.
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!