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
stepladder [879]
3 years ago
5

How much oxygen is contained in the atmosphere?

Biology
1 answer:
GrogVix [38]3 years ago
3 0
0B)21% that’s your answer
You might be interested in
The heart is part of the cardiovascular system and is made of cardiac muscle. Cardiac muscle has special characteristics that di
Schach [20]
<h2><u>Answer:</u></h2>

<u>cardic muscles:</u> are present only in the heart .single cell is not very strong by itself, millions of cardiac muscle cells working together are easily able to pump all of the blood in the body through the heart in less than a minute. Cardiac muscle cells have a branched shape so that each cell is in contact with three of four other cardiac muscle cells.

<u>characteristics  of cardic muscles: </u> one nucleus ,striated, involuntary, branched and joined to one another by intercalated discs that contain  gap junctions for depolarization between cells and  hold the fibers together when the heart contracts.

3 0
3 years ago
Read 2 more answers
Answer the questions plz
exis [7]

Answer:

1) A double Helix with complementary bases in the middle. The backbone is made of sugar and phosphates. The middle is bases

2) To hold the genetic info for the cell

3) To bring the genetic info from the nucleus to the ribosomes as DNA can't leave the nucleus

4) To bring amino acids to the ribosomes to help build a protein

5) A chain of amino acids held together by peptide bonds

6) Ribosomes

7) Because those are the bases that are complementary in DNA so they must be equal

8) It could lead to a mutation as it would cause the mRNA to code for a different amino acid and thus a different protein will be made

9) DNA is the blueprint for mRNA which will travel to the ribosomes and code for specific amino acids which will eventually build a protein

5 0
3 years ago
Which are the only invertebrates that can fly?
ExtremeBDS [4]
Your answer would A insects because insects are the only invertebrates that can maintain flight. FOr example Butterflies and Flies Can maintain flight
Hope this has helped :)<span />
3 0
2 years ago
Read 2 more answers
A web of proteins in the cyoplasm that help support, anchor organelles and also help with movement is the __________.
zvonat [6]

Answer:

<em>T</em><em>he cytoskeleton</em>

<em>The cytoskeleton functions to create a network organizing the cell components and to also maintain the cell shape. It also provided a uniform movement of the cell and its organelles, by the filament system network found in the cell's cytoplasm</em><em>.</em>

<em>Hope</em><em> </em><em>this</em><em> </em><em>helps</em><em> </em><em>u</em><em>.</em><em>.</em><em>.</em>

3 0
2 years ago
In terms of alternation of generations, the internal parts of the pollen grains of seed-producing plants are most similar to a _
Ket [755]

The correct answer is D) fern gametophyte bearing only antheridia.

8 0
3 years ago
Other questions:
  • Since hemoglobin is attracted more to carbon monoxide than it is to oxygen, what is likely to happen to a person if he breathes
    6·2 answers
  • Which of these would best describe the outcome of increasing the kinetic energy of the molecules in the above picture
    8·2 answers
  • The process in which one species evolves into a variety of species is called apes
    9·1 answer
  • What information is collected in a forensic lab
    9·2 answers
  • Giving brainliest answer quicklyyy
    7·2 answers
  • Which color has the shortest wavelength
    11·2 answers
  • Please help don’t have a lot of time
    10·1 answer
  • Which of the following is an irrational number?
    5·1 answer
  • Which of the following geologic processes occurs in the shortest amount of time?
    9·2 answers
  • I need help on this question
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!