Water diffusion is called osmosis. Oxygen is a small molecule and it's nonpolar, so it easily passes through a cell membrane. Carbon dioxide, the byproduct of cell respiration, is small enough to readily diffuse out of a cell. Small uncharged lipid molecules can pass through the lipid innards of the membrane.
Answer:
No one can see in total darkness. Fortunately, there’s almost always some light available. Even if it’s only dim starlight, that’s enough for your eyes to detect. What’s truly amazing is how little light is required for you to see.
Human eyes have two main features that help us see better in low light: the pupil’s ability to change size, and the eye’s two types of light-sensing cells.
Opening up to let in more light
Your pupils are the black areas at the front of your eyes that let light enter. They look black because the light that reaches them is absorbed inside the eyeball. It’s then converted by your brain into your perceptions of the world.
You’ve probably noticed that pupils can change size in response to light. Outside on a bright sunny day, your pupils become very small. This lets less light into the eye since there’s plenty available
The time taken to double the population is 58 years.
<h3>What is exponential growth?</h3>
An exponential growth problem is one for which we define the model; P= Poe^rt
Where;
P = population at time t
Po = initial population
r = population growth rate
t = time taken
1800000 = 900,000e^(0.012 × t)
1800000/900,000 = e^(0.012 × t)
2 = e^(0.012 × t)
ln2 = 0.012 × t
t = ln2/0.012
t = 58 years
Learn more about population growth: brainly.com/question/12228859
