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3 years ago

In which scenario could natural selection most obviously occur?

2 answers:

8 0

Natural selection is likely when there are stronger selection pressures. For example, a perpetual selection pressure is the fact that organisms have to compete for food and resources, meaning the best adapted ones survive. However, a stronger selection pressure may cause natural selection to occur more obviously. An example of this is when the number of white peppered moths decreased during industrialization in England due to the soot collecting on the trees. The change in population was very fast and obvious.

krek1111 [17]3 years ago

6 0

a population of salmon with different skin colors that are involved in attracting mates

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Eyepiece magnification(EM) X Objective magnification (OM)= Overall Magnification:

gregori [183]

Answer:

I. Overall magnification (TM) = x40

II. Overall magnification (TM) = x100

III. Overall magnification (TM) = x400

IV. Overall magnification (TM) = x1000

Explanation:

A microscope can be defined as an optical device that is typically used to make an enlarged (magnified) image of a minute (small) object and as such reveals all the little information about the object that cannot be seen by the natural human eye.

Mathematically, the overall (total) magnification of a microscope is given by the formula;

Overall magnification (TM) = Eyepiece magnification(EM) X Objective magnification (OM).

I. When EM = x10 and OM = x4

TM = EM * OM

TM = x10 * x4

TM = x40

II. When EM = x10 and OM = x10

TM = EM * OM

TM = x10 * x10

TM = x100

III. When EM = x10 and OM = x40

TM = EM * OM

TM = x10 * x40

TM = x400

IV. When EM = x10 and OM = x100

TM = EM * OM

TM = x10 * x100

TM = x1000

3 0

3 years ago

What must occur for a process to be a chemical reaction?

VLD [36.1K]

There must be a change in the chemical composition of the substance and the change is highly irreversible

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3 years ago

What letters do we use to represent the base pairs

sasho [114]

Cytosine (C) - both;

Thymine (T) – DNA;

Uracil (U) - RNA.

Adenine (A) - Both

Guanine (G) - Both

These are the letters that we use to represent the nitrogenous base pairs that make up and thus define a nucleotide

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3 years ago

Name the subdivisions of the small intestine in a proximal to distal direction. do the same for the subdivisions of the large in

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The duodenum can therefore be subdivided into four segments: the superior, descending, horizontal, and ascending duodenum. ... The three regions of the small intestine are the duodenum, jejunum, and ileum. The jejunum is about 0.9 meters (3 feet) long (in life) and runs from the duodenum to the ileum.

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3 years ago

Morgan, as an infant, had serious problems when breast feeding. he drooled excessively, choked, and became cyanotic. other than

dezoksy [38]

Tracheoesophageal fistula

Tracheoesophageal fistula (TE) is a condition in which an abnormal channel (fistula) connects the trachea to the oesophagus. It is a birth defect and is characterized by extensive salivation with choking, vomiting and cyanosis during feeding. When eating, food substances move through abnormal connection and this can cause other illnesses. From the question given above, Morgan is likely have tracheoesophageal fistula.

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3 years ago