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olga nikolaevna [1]
2 years ago
5

How do animals get nitrogen?

Biology
1 answer:
kompoz [17]2 years ago
4 0

Animals get the nitrogen they need by eating plants or other animals that contain nitrogen. When organisms die, their bodies decompose bringing the nitrogen into soil on land or into ocean water. Bacteria alter the nitrogen into a form that plants are able to use.

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Scientists can identify the gene mutated in a bacterial auxotroph by transforming the cells with a genomic library in which frag
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Answer: false

Explanation: this can only be true if the genes in the genomic library fragments have been identified and if the mutation is an SNP and not an inversion or deletion or insertion, whether they were cloned into plasmids or not.

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A farmer wants to know if adding antibiotics to cow feed will fatten them up. He takes two groups of 25 cows each. One group is
galina1969 [7]

Answer:

The correct answer is-

Hypothesis: Antibiotics cause weight gain in cows.

Independent Variable: Antibiotic pill

Dependent Variable: Weight of cow

Control Group: a group of cows gets a placebo pill

Experimental Group: a group of cows gets an antibiotic pill

Explanation:

The Independent variable is the variable that causes the response from the dependent variable or affects the dependent variable in this study the antibiotic pill affects the weight of cows so The independent variable is an antibiotic pill and the dependent variable is the weight of cows.

The control group is the group of subjects that did not get the treatment in a scientific study in the case of this study group of cows that receives the placebo pill is the control group and the experiment group is subjects that receive the treatment which is a group with the antibiotic pill.

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3 years ago
Which of the following is a form of point-source pollution? a. oil leaks from automobiles c. pesticide runoff b. gasoline leaks
iris [78.8K]
D) sludge dumping is going to be correct
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3 years ago
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Why is permeable soil best for plants that need a lot of drainage?
Svetradugi [14.3K]

Answer:

Permeable soil will let more water and air to drain through the plant as this type of soil loses too much water.

Explanation:

A soil possessing an enhanced quality to transfer water is known as permeable soil. Hence, there would be more drainage in the soil with enhanced permeability. Permeable soil loses more water as compared to the impermeable ones. Hence, choosing permeable soil would be best for plants that require a lot of drainage. To check permeability of soil two types of tests are performed which are the constant head method and falling head method.

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Acid Rain goes in lakes and other water sources where animals drink water. When drinking for acid rain water animals get sick and plants dependent on water sources die off.

Explanation:

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