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Bas_tet [7]
3 years ago
8

The atomic theory explains that all matter is made up of tiny particles called atoms WWW Which two pieces of evidence support th

e atomic theory? in the picture the first one is a telescope
​

Biology
1 answer:
Serhud [2]3 years ago
6 0

Answer: C and D

Explanation:

B is talking about cells, so it's not relevant

A has nothing to do with this at all honestly

So C and D are the right answers

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What does it mean for a membrane to be selectively permeable?
maw [93]

Answer;

Semi-permeability means that only certain molecules are allowed to pass through.

Explanation;

-Semi-permeability is one of the features of a cell membrane, which means that the membrane allows selective movement of materials in and out of the cell; that is only certain molecules can enter or leave the cell.

-For example smaller molecules such water and ions such as potassium and sodium ions are able to leave and enter the cell, while other molecules that are large such as protein molecules can not enter or leave the cell.

3 0
3 years ago
Read 2 more answers
Using at least 3 steps explain how to make a wet mount slide with an Elodea plant​
Masja [62]
Step One - Obtain a clean microscope slide.

Step Two - Place a drop of liquid on the slide. This is the “wet” part of the wet mount. The liquid used depends on the type of cell being viewed:
If examining a plant cell, tap water can be used.
If examining an animal cell, physiological saline (or contact lens solution) must be used, because if plain water is used, the cell will explode from osmotic pressure. Unlike plant cells and bacteria, animal cells have no cell wall to structurally support them.

Step Three - Obtain the specimen to be used. Some introductory biology classics for viewing include:
Skin of an onion bulb: In order to view the cells, a very thin layer of skin must be obtained. Take a single layer of onion and bend it towards the shiny side. After it snaps, pull gently, and a transparent layer of skin, similar to Scotch tape, will appear.
Elodea leaf: Elodea leaves are two cell layers thick. The cells in one layer are smaller than the cells in the other, so elodea leaves can be used to better understand a microscope's depth of field.
Cheek cells: Human epithelial cells can be obtained by gently rubbing a toothpick on the inside of the mouth, and then swirling the toothpick in the physiological saline on the slide.
Pond water: Obtaining some water from a pond makes wet mount preparation a breeze, since the water and the specimens are both included.
Hope this helps
8 0
3 years ago
An element's atomic number is the
Llana [10]
An element's atomic number is the amount of protons (positively charge subatomic particle found in the atoms nucleus) present in one atom of that element.
3 0
3 years ago
What happens to the motion of an object when the forces acting on it are balanced
Ira Lisetskai [31]

When the entire group of forces acting on an object is balanced, the vector sum  

of the forces is zero, and the effect of the group of forces on the object's motion  

is identical to the effect of no force at all. The object continues in constant uniform  

motion.  

To state the outcome of the situation in three different ways:  

-- The object's acceleration is zero.  

-- The object's velocity is constant.  

-- The object's speed and direction of motion don't change.  

The direct answer to the question is: Nothing happens to its motion.

5 0
3 years ago
"a client with osteoarthritis purchased a copper bracelet to wear and tells the nurse that there is less pain now. which respons
xenn [34]
Copper bracelets and magnetic wristbands are used relieve pain in people with arthritis. Studies conducted on these devices show that they have no efficacy on pain or on stiffness, two of the most characteristic symptoms of arthritis. Although there is no medical data to support the efficacy of the copper bracelet, the patient is not harmed or endangered by wearing it. Therefore, the nurse should respect the fact that the patient is feeling better, but he/she should urge the patient to continue with its prescribed medication. 

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