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dmitriy555 [2]
3 years ago
14

The most appropriate microscope for visualizing a living bacterial cell that is non-pigmented and unstained is:

Biology
1 answer:
sammy [17]3 years ago
7 0
The electron microscope
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An experiment is done on 90 people to test their vitamin D levels: 30 are given vitamin D tablets, 30 are told to spend 15 minut
Jet001 [13]

Answer:

The correct answer is -

The control group: the group of people with no supplements and kept inside.

The dependent variable: Vitamin D level in all groups.

The independent variable: the source of vitamin D (sun or tablets)

Explanation:

The control group of any experiment is the group of subjects that did not receive any type of treatment or did not manipulate by the independent variable. Here the group of 30 people that kept inside and did not get supplements is the control group.

The independent variable is a variable that directly affects the dependent variable by a change in the independent variable. In this experiment, the sunlight and vitamin D tablets are independent variables that affect the vitamin D level in people.

The dependent variable is a variable that is affected by the independent variable or depends on the independent variable, vitamin level is the dependent variable.

3 0
3 years ago
Identify the elemental makeup of proteins.
il63 [147K]

Answer:

Carbon, Hydrogen, Oxygen, Nitrogen, and Phosphorus

Explanation:

Proteins are mainly made up of amino acids. The basic structure of amino acids is that they have a carboxylic group, amino group and side chain. The carboxylic group is mainly Carbon, Hydrogen and Oxygen. The amino group is mainly Nitrogen and Hydrogen. The side chains are unique per amino acid having different elements including Phosphorus.

5 0
3 years ago
Cosmologists are scientists who study stars, galaxies, black holes, and other objects in the universe. In order to study the bil
VashaNatasha [74]

Answer:

The Cosmologist have to purchase use telescope so they can see the outside world.

3 0
3 years ago
What is the major function of the lymphatic system?
Norma-Jean [14]

Answer: d. return leaked fluids back to the cardiovascular system.

Explanation:

The lymphatic system is a web of vessels and tissues that transfers clear fluid that is called as the lymph. The lymphatic system spreads all over the body and filters and clean up the lymph, abnormal cells and pathogens. The filters traps the foreign particles from the blood. It also promotes the filtered fluid to reach back to the cardiovascular system and distribute to all the parts of the body in the form of blood.  

       

6 0
3 years ago
The eye of a hurricane has the
VMariaS [17]

Answer:

Well the eye is the most calm part of both a tornado and hurricane, so its D, Warmest temperatures :)

Hope this helped you :))

6 0
3 years ago
Read 2 more answers
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