answer.
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
Travka [436]
1 year ago
15

Which of the following must always be replaced when a retrofit is performed?

Biology
2 answers:
Volgvan1 year ago
4 0

Answer:

D. Refrigerant oil.

Explanation:

The job of a refrigerant oil is to lubricate the compressor, if you don't replace it, you may lose your compressor and all are gonna be ruined.

That's why is more important. Also, depending on the situation, because every situation aren't the same.

Olegator [25]1 year ago
3 0
The answer is c, hope it helped
You might be interested in
List at least three scientific disciplines related to chemistry mentioned or alluded to in the article.
Bogdan [553]

Scientific Disciplines:

Biochemistry and Molecular Biology.

Cancer Biology.

Cell Biology.


Chemistry:

Developmental Biology and Genetics.

Immunology.

Microbiology.

Neuroscience.


3 0
1 year ago
Read 2 more answers
Classifying the characteristics of dna, mrna, and trna determine from the description if each characteristic applies to dna, mrn
Jlenok [28]
The DNA, mRNA and tRNA are the essential nucleic acids that initiate protein synthesis. The DNA contains the genetic code of our human body in the form of chromosomes. It is composed of nucleic acids like uracil (U), guanine (G), adenine (A) and cytosine (C). The messenger RNA or mRNA carries this code called codons expressed in three-letter codes. Each amino acid has its own assignment of code. The mRNA carries this code to the ribosome which is the site for protein synthesis. The translational RNA or tRNA contains anti-codons to translate the codes in the mRNA into amino acids that link together to form proteins.
4 0
2 years ago
Henry bought 280 red and blue paper cups. He used of the blue
stellarik [79]

Answer:didn’t put the number for how many blue cups were used

Explanation:

6 0
2 years ago
A student formulated a hypothesis that water-soluble pollutants damage living organisms by increasing the permeability of cellul
xenn [34]

Answer:

The absorbance of 460nm light by the treatment solutions was the test performed by the student.

Explanation:

Cell membranes are phospholipid bilayers which are mostly displayed by the 'fluid mosaic model' which consists of proteins, carbohydrate polymers and glycoproteins making them able to move around quite freely amongst the phospholipids. A normal membrane permeability test involves investigating the effects of a named variable on the membrane permeability of any vegetable such as beetroot whose biological name is Beta Vulgaris. The variables to investigate are the influence of solvents and temperature because these factors can change the fluidity of the membrane. Beetroot is an important item for this test because of the distinctive betalains pigment that its stem tuber contains. These pigments form an important signal indicating membrane fluidity as they are usually contained in the vacuole of intact beetroot cells. An instant or constant increase in membrane fluidity will cause the pigment to spill out of the cell, and the amount of pigment can be measured simply by using a colorimeter.

The above description is performed under the test of The absorbance of 460nm light by the treatment solutions.

5 0
1 year ago
Read 2 more answers
Which of the following eukaryotic intracellular components are not organelles?
ratelena [41]
B. A cytoskeleton is not an organell in a eukaryotic cell. We're as Golgi, ER, and Lysosomes are all very important organells in eukaryotic cells.
8 0
2 years ago
Other questions:
  • a friend tells you he read somewhere that rotting garbage can turn into maggots which are fly larvae, and the maggots then can g
    13·2 answers
  • Which subatomic particle is most involved in forming chemical bonds
    11·1 answer
  • Which force makes it harder to boil water on a stove?
    5·1 answer
  • Blood is composed of many tiny cells in a liquid called plasma. Blood is actually considered a colloid. The dispersed state of m
    7·2 answers
  • What acts as a source of heat in the mantle and results in mantle convection?
    7·2 answers
  • A close evolutionary relationship between annelids and mollusks is suggested by the presence of a _____ larva in both phyla as w
    13·1 answer
  • Consider a cross of beetles with exoskeleton alleles B and b and leg size alleles N and n. The maleparent is heterozygous in bot
    10·1 answer
  • TP synthesis in glycolysis: substrate-level phosphorylation. The ATP that is generated in glycolysis is produced by substrate-le
    15·1 answer
  • 1. The part of plants that contains structures needed to absorb sunlight and carbon dioxide is the Fill in the blank text field
    8·2 answers
  • 20. Edward Lambert, an Englishman, was born in 1717. Lambert had a skin disorder characterized by very thick skin that was shed
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!