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
Karolina [17]
3 years ago
9

A barrier that allows some substances in while keeping other

Biology
1 answer:
egoroff_w [7]3 years ago
5 0
C cause it let certain type particles to move threw
You might be interested in
Scientists often use models of the earth because
dimaraw [331]

Answer:

Scientists often use models of Earth to study the movement of earth and it's moon. They figure out what the distance is from the moon to the point between earth and moon where the gravitational pulls of earth and moon are equal.

8 0
3 years ago
Why is there a delay between the ecg pattern and the resulting beat of the heart?
Rama09 [41]

<span>There would be a delay between the ECG pattern and the resulting beat of the heart because it takes time for the pulse to travel from the systole (ventricular contraction) to the radial artery. Pulse cannot be felt in the finger. It can be felt with a pulse oxymeter.</span>

4 0
3 years ago
If you are looking at your reflection in the concave side of a spoon and begin to move the spoon further away from your face, wh
creativ13 [48]
Your reflection will warp.  I don't mean to be rude, but don't you have a spoon to test this out for yourself?
4 0
3 years ago
Chimpanzees belong to the animal kingdom, and mushrooms belong to the fungus kingdom. What do they have in common?
olga55 [171]
I think they are both heterotrophs 

7 0
3 years ago
Nitrogen is generally available to plants in only two forms : ammonium and
Zepler [3.9K]

plants get nitrogen from ammonium and nitrate

3 0
3 years ago
Other questions:
  • Biology question 3
    11·1 answer
  • Terry erwin and janice scott used an insecticide to knock down insects from the canopy of several trees. why did they do this?
    12·1 answer
  • While examining a specimen under the microscope, Janet discovers a structure that has some genetic material that has RNA but not
    11·2 answers
  • When does recycling happen in the mineral resource cycle?
    15·2 answers
  • One of the main water lines supplying the houses in a town has broken and everyone was told to boil their drinking water until t
    15·1 answer
  • Cycadophyta is a group of plants with a small number of extant species, that is nevertheless well known from fossils from the Me
    8·1 answer
  • What would happen to the oceans if continental and oceanic crust had the same density?
    13·1 answer
  • WILL CROWN THE BRAINLEST ANSWER! PLEASE HELP!
    6·2 answers
  • Which statement explains why oxygen molecules easily diffuse across a cell
    13·1 answer
  • What period has the least amount of biodiversity
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!