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
krok68 [10]
3 years ago
13

What allows substances to go through the cell?

Biology
2 answers:
Rudik [331]3 years ago
8 0
Even the cell membrane is like the cell wall its flexible and lets certain things in and certain things out.
mezya [45]3 years ago
6 0
The cell membrane. hope it helps

You might be interested in
What did the scientist study with his microscope?
Novay_Z [31]
I found the answer to be cells
6 0
3 years ago
Elements in group 16 want to bond with elements in group_____
irga5000 [103]

Answer:

oxygen, sulfur, selenium, tellurium, polonium, and ununhexium (O, S, Se, Te, Po, and Uuh, respectively)

Explanation:

i hope it helps all this are 6 valence from electron and form 2-iron.

7 0
3 years ago
Which is required for sexual reproduction
Olegator [25]

Answer:

meiosis

Explanation:

meiosis is used to produce gametes for sexual reproduction

5 0
3 years ago
Read 2 more answers
A _____ is a place that is strictly controlled in order to protect a species from extinction. wilderness wildlife sanctuary zoo
Dmitrij [34]

A wildlife sanctuary is a place that is strictly controlled in order to protect a species from extinction.

6 0
3 years ago
Read 2 more answers
PLEASE HELP!! ILL GIVE BRAINLIEST :((!!
melisa1 [442]
Reflecting telescopes
Telescopes that use lenses are called refracting telescopes. The other type uses mirrors to focus the light of the image. These telescopes are called reflecting telescopes. Refracting telescopes use lenses to bend the light to a specific focal point such that the object will be magnified to the viewer.

light microscope
Optical instruments are based on optics. They use mirrors and lenses to reflect and refract light and form images. The light microscope and telescope use convex lenses and mirrors to make enlarged images of very tiny or distant objects. A camera uses a convex lens to make a reduced image of an object.

Refracting telescopes use lenses to focus the light, and reflecting telescopes use mirrors. I'll talk first about refracting ones. Refracting telescopes work by using two lenses to focus the light and make it look like the object is closer to you than it really is. Both lenses are in a shape that's called 'convex'.

the reflector telescope uses a mirror to gather and focus light. All celestial objects (including those in our solar system) are so far away that all of the light rays coming from them reach the Earth as parallel rays. Because the light rays are parallel to each other, the reflector telescope's mirror has a parabolic shape. The parabolic-shaped mirror focusses the parallel lights rays to a single point. All modern research telescopes and large amateur ones are of the reflector type because of its advantages over the refractor telescope.

Advantages

Reflector telescopes do not suffer from chromatic aberration because all wavelengths will reflect off the mirror in the same way.
Support for the objective mirror is all along the back side so they can be made very BIG!
Reflector telescopes are cheaper to make than refractors of the same size.
Because light is reflecting off the objective, rather than passing through it, only one side of the reflector telescope's objective needs to be perfect.

Disadvantages

It is easy to get the optics out of alignment.
A reflector telescope's tube is open to the outside and the optics need frequent cleaning.
Often a secondary mirror is used to redirect the light into a more convenient viewing spot. The secondary mirror and its supports can produce diffraction effects: bright objects have spikes (the ``christmas star effect'').

hope this helped!




4 0
2 years ago
Other questions:
  • What causes the formation of trenches in Earth’s crust?
    11·1 answer
  • How do the effects of climate change differ from the effects of habitat alteration, invasive species, overharvesting and polluti
    15·2 answers
  • Pls help i’m miserable
    15·1 answer
  • . Consider the following scenarios. State whether the mutation is likely to be passed on to the offspring of the organism. Expla
    10·1 answer
  • Glaciers existed in many parts of the world but have melted. Scientists can detect that an area was once covered by a glacier us
    11·2 answers
  • Is domestication the process where animals are trained to do tricks useful for human needs?
    10·1 answer
  • HELP ME!!!!!<br> How are bacteria, a rose, and an elephant alike?
    12·2 answers
  • If a parasite began attacking the fog beetles increasing their death rate to .12, how would this change alter the growth rate of
    14·1 answer
  • Two possible reasons for unemploymen​
    8·1 answer
  • Hi can someone please help me with these 3 questions!!!!
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!