BIOLOGY MIDDLE SCHOOL

Please help!!Which gas is most abundant in earth’s atmosphere?
A.
oxygen

B.
nitrogen

C.
carbon dioxide

D.
methane

Answers

Answer 1
Answer: Nitrogen is the most abundant gas in the earths atmosphere
Answer 2
Answer: The answer would be B nitrogen which accounts for 78% of the atmosphere

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What are the characteristics of Archaebacteria

PLEASE NEED CORRECT ANSWERS ASAP 40 POINTS Gastric juices are secreted by glands which are located in the _____.small intestine
mouth
stomach
pancreas

Match these items.

1. absorbs most ultraviolet rays

stratosphere
2. lowest layer of the atmosphere

greenhouse effect
3. starts seven miles above the earth

thermosphere
4. layer composed of layers

troposphere
5. important for its radiowave reflection

ozonosphere
6. trapping of heat by earth's atmosphere

ionosphere

Answers

Answer:

1.stomach

1. Ozonosphere

2. Troposphere

3. Stratosphere

4. Thermosphere

5. Ionosphere

6. Greenhouse

Explanation:

looked up

1.stomach

1. Ozonosphere

2. Troposphere

3. Stratosphere

4. Thermosphere

5. Ionosphere

6. Greenhouse

What do birds like to eat?

Answers

Birds eat worm,ants,nectar,flower,nuts,some insects and some types of fruit.
Birds eat insects, worms, fruit, flower nectar, seeds, nuts, etc.

Explain how atoms and molecules are important to the cell processes.

Answers

First let's start with the levels of organization.  The levels of organization are atoms, molecules, cells, tissue, organs, organ system, and organism.  Atoms and molecules are important to cell processes becuasse without them, there would be no celland there would be no cell processes, and in the end, there would be no organism.

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 does the allele frequency have to total in the hardy- Weinberg equilibrium?

Answers

In addition, the sum of the allele frequencies for all the alleles at the locus must be 1, so p + q = 1. ... In population genetics studies, the Hardy-Weinberg equation can be used to measure whether the observed genotype frequencies in a population differ from the frequencies predicted by the equation.

Hope this helps

Answer:

1. directional selection

2. Hardy-Weinberg equilibrium

3. sympatric

4. This is allopatric speciation.

5. This is an example of stabilizing selection in a population because the organisms in the middle of the population have the best fitness for their environment.

6. The five conditions impacting this equilibrium are: mutations, nonrandom mating, genetic drift, migration, and natural selection.

7. Natural selection impacts single-gene traits because of the possible extinction of one trait or increase of another trait. If a trait is found to be not preferable in that environment, it could be eliminated through natural selection.

8. The total allele frequency in the Hardy-Weinberg equilibrium has to equal 1.:

from Penn Foster

Which of the following is/are part of the nitrogen cycle:a. eutrophication
b. denitrification
c. saturation
d. all of the above

Answers

The correct option is 
b. denitrification....

the correct answer is b. denitrification
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