BIOLOGY MIDDLE SCHOOL

Which of the following is an example of a mixture?A.
hydrogen gas
B.
iron metal
C.
salt water
D.
sugar

Answers

Answer 1

Answer:

Answer:

C.)Salt Water

Explanation:

When salt is dissolved in water is is considered a mixture because it is homogeneous throughout the substance

Answer 2

Answer: Salt water is an example of a mixture. Those to elements mixed together creates a mixture of salt and water, which makes salt water.

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How much energy stored within an organism?How much energy is lost as heat to the environment?
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Which statement comparing examples of renewable and nonrenewable resources is true? A. Geothermal energy is a nonrenewable resource because it can't be used up, but natural gas is a renewable resource because it will eventually run out. B. Geothermal energy is a renewable resource because it can't be used up, but natural gas is a nonrenewable resource because it will eventually run out. C. Both geothermal energy and natural gas are renewable resources because they will never run out. D. Both geothermal energy and natural gas are nonrenewable resources because they will eventually run out.

In 1967 a penicillin-resistant pneumonia, caused by Streptococcus pneumoniae and called pneumococcus, surfaced in a remote village in Papua, New Guinea. At about the same time American military personnel in southeast Asia were acquiring penicillin-resistant gonorrhea from prostitutes. By 1976, when the soldiers had come home, they brought the new strain of gonorrhea with them and physicians had to find new drugs to treat it.

In 1983 a hospital-acquired intestinal infection caused by the bacterium Enterococcus faecium joined the list of bacteria that could not be killed by penicillin.
Which of these BEST describes why certain bacteria have become resistant to penicillin?
A) The penicillin in the 1970's was much weaker that the penicillin used today, thus it was not as effective.
B) Penicillin was not effective in treating any bacterial diseases, so the doctors had to find new treatments.
C) These new bacterial strains came out of the jungles and forests already equipped to be penicillin-resistant.
D) Penicillin was so heavily prescribed by doctors that it led to certain, more fit, strains of bacteria to be able to survive.
2)

Answers

I think B but i’m not for sure

Answer:

D. Penicillin was so heavily prescribed by doctors that it led to certain, more fit, strains of bacteria to be able to survive.

Explanation:

Researchers thought penicillin was the cure for all, and thus it became overused. Through natural selection, new, stronger strains of bacteria developed.

What is the difference between sedimentary and metamorphic rock?

Answers

Metamorphic are formed through change underground sedimentary are formed through sediment

Sedimentary rock is formed from sediments that have gone through weathering, erosion, Depposition, compaction and cementation. Metamorphic rock is a igneous, sedimentary or metamorphic that has been changed through heat and pressure

What is the boundary between the warmer surface water and colder deep ocean water called

Answers

Thermocline it can be in the ocean or in a lake but either way it's thermocline.

i believe it is called the thermal layer

CO2 is an example of a(n) _____. atom molecular compound element mixture molecule

Answers

CO2 or carbon dioxide is an example of a compound element. A compound element is formed into a new substance when two or more elements are chemically combined. One of the most common examples is CO2 or carbon dioxide. The elements combined are carbon and oxygen.

Mitochondria and chloroplasts are two types of

Answers

Hey there,

Mitochondria Have DNA. Mitochondria and chloroplasts have striking similarities to bacteria cells. They have their own DNA, which is separate from the DNA found in the nucleus of the cell. And both organelles use their DNA to produce many proteins and enzymes required for their function.

Hope his helps if so please mark brainiest!

Final answer:

Mitochondria and chloroplasts are two types of organelles present in cells. Mitochondria produce ATP, the cell's main energy source, while chloroplasts in plants and algae conduct photosynthesis.

Explanation:

Mitochondria and chloroplasts are two types of specialised structures, or organelles, found within cells. They each play critical roles in energy( in different forms) provision for the cell.

Mitochondria, often referred to as the 'powerhouses of the cell', generate most of the cell's supply of adenosine triphosphate (ATP), which is used as a source of chemical energy.

On the other hand, chloroplasts are found in plant cells and some algae. They are responsible for photosynthesis, a process by which sunlight, carbon dioxide, and water are converted into food for the plant.

Learn more about cell organelles here:

brainly.com/question/37216910

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What does 5' & 3' mean in DNA

Answers

Hai :3

Great question. "5' & 3'" means five prime and three prime. Have you ever seen DNA's molecular structure? Well, these numbers indicate the carbon on the sugars that DNA has.

-The 5' bears a phosphate group ( $PO_(4) ^(-3)$ ), and the 3' bears a hydroxyl group ( $OH^(-)$ ).