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AnnZ [28]
4 years ago
8

Is it true that all things in earth have two or more cells?

Biology
2 answers:
ICE Princess25 [194]4 years ago
4 0
That is false..their are unicellular organisms
aalyn [17]4 years ago
3 0
No, there are unicellular organisms or single-celled organisms which have one cell...

Please mark as brainliest...
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The two complementary strands of DNA are held together by
Triss [41]
Hydrogen bonding 


(Between Adenosine and Thymine, and Guanosine and Cytosine)
5 0
3 years ago
Read 2 more answers
Select each correct answer. More than one answer may be correct.
3241004551 [841]

Answer:

b. by increasing the heart rate

c. by increasing the respiratory rate

Explanation:

Increased activity of skeletal muscles would require an increased supply of oxygen to these cells to sustain the muscle contraction. Muscle cells perform aerobic cellular respiration in the presence of oxygen and produce ATP molecules to be used during muscle contraction. Therefore, there is an increase in heart rate to pump sufficient blood to the skeletal muscles which in turn ensures enough supply of oxygen. Also, there will be an increase in the respiration rate to inhale the required oxygen.

8 0
3 years ago
What are some properties of carbon? Please help
lilavasa [31]

Answer:

Properties Of Carbon :

Explanation:

Carbon:

Symbol: C

Electronic Configuration: 2 , 4

Valency : 4 (Tetra-valency)

Occurrence in nature →Earth's crust → 0.02% in the form of minerals like carbonates, coal, petroleum.

In atmosphere -0.03% in carbon dioxide is ( gaseous form)

Properties of carbon:

  1. Carbon forms Covalent is bonding and Covalent compounds wwhich do not conduct electricity.
  2. Carbon has three  allotropes i.e Diamond, Graphite and Fullerenes.
  3. In diamond carbon atoms bonded together in tetrahedral lattice arrangement.
  4. In graphite carbon atoms are bonded together in sheets of hexagonal lattice.
  5. In Fullerenes ccarbon atoms are bonded together in spherical, tubular, or ellipsoidal forms.
  6. Carbon plays a major role in organic compounds.
  7. Carbon is a Tetravalency. (valency :4)
  8. So that  it is easily share the electrons so that  it gives a possibility of large number of compounds. Carbon compounds are also called as organic compounds. Carbon compounds are also called organic compounds.
3 0
3 years ago
Please help, its for a test!
SVEN [57.7K]

(hi, i dont know about this one personally, but i found an answer somewhere else on the internet thatll hopefully help u)

Answer: They consist of long chains of C, H, and O.

Explanation:

In terms of chemical composition, lipids differ from nucleic acids and proteins because they mostly just contain carbon, hydrogen, and oxygen (except for phospholipids which of course contain phosphorous). In addition to those elements, proteins contain nitrogen and sulfur, and nucleic acids contain nitrogen and phosphorous.

Carbohydrates share the C, H, and O composition as lipids, but they differ in structure. Lipids are generally exist as triglycerides, which consist of a triple hydroxyl alcohol (glycerol) that has bonded to three long-chain carboxylic acids (fatty acids) in a triple condensation reaction. Carbohydrates on the other hand are made of carbon ring structures that either remain alone or polymerize into long polysaccharide chains.

8 0
3 years ago
PLEASE HELP! Describe what you know about enzymes that explains your evidence and your claim.
grigory [225]

Answer:

In the case of catalase, the optimum pH is approximately pH 7.0. That is, catalase works best at a neutral pH. If the solution is too acidic (low pH value) or too basic (high pH value) the catalase is inactive and no longer functions as an enzyme.

hope this helps!!:)

Explanation:

7 0
3 years ago
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