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
sasho [114]
3 years ago
7

What are four structures used for gas exchange

Biology
1 answer:
kotegsom [21]3 years ago
6 0


Single-celled organisms exchange gases directly across their cell membrane. However, the slow diffusion rate of oxygen relative to carbon dioxide limits the size of single-celled organisms. Simple animals that lack specialized exchange surfaces have flattened, tubular, or thin shaped body plans, which are the most efficient for gas exchange. However, these simple animals are rather small in size.

You might be interested in
4
Sonbull [250]

Answer:

All choices are correct

Explanation:

The most well known was a botanist who studies plants too realized that plats,living things are made of cells so most likely the answer would be all living things are made of cells

I hope this helps, I am only in the 7th grade and this was pretty easy to me

5 0
3 years ago
Difference between viruses and cells?
ElenaW [278]
<h2>Answer:</h2><h2>Cells exist by themselves such as bacteria....</h2>

Whilst Virus are non loving infectious particles and need a living host to reproduce.

8 0
3 years ago
Read 2 more answers
The loss of an embryo or fetus during the first 20 weeks of pregnancy is referred to as a miscarriage or __________.
Nata [24]
Stillbirth is the only other thing I’ve heard a miscarriage be called, hope that helps
5 0
4 years ago
Read 2 more answers
British scientist who first observed cells under a microscope was _____
Sav [38]

Robert Hooke is the first person to observe cells as microscopic structures.

He was of British descent and, fun fact, he discovered cells by looking at a sliver of cork under a microscope lens (although the 'fun fact' is heavily simplified).

7 0
3 years ago
Read 2 more answers
Which layer of the atmosphere contains most of the carbon dioxide and
Bess [88]

I'm not too sure but

D. Troposphere

7 0
3 years ago
Read 2 more answers
Other questions:
  • 3. Which process makes sexual
    15·1 answer
  • The brain and spinal cord are part of what system?
    15·2 answers
  • I am reaserching white fox scientits for school, Know any?
    11·1 answer
  • The simple sugar produced by plants is called .
    8·1 answer
  • The following table describes several molecules and their functions. The molecules all belong to the same class.
    6·2 answers
  • If a child is watching a favorite sibling getting scolded for misbehavior, a _____ neuron is likely to be activated in an empath
    9·2 answers
  • In your own words, please explain why does the ocean crust sink?
    8·2 answers
  • Please number these from smallest to largest.
    10·2 answers
  • Help with the Name of these labels ?
    5·1 answer
  • Most of the aerobic respiration of a cell takes place in which structure?
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!