Answer: The correct answer is Mouth, Pharynx, Esophagus, Stomach, and Small intestine.
Alimentary canal is also known as digestive tract. It represents a pathway through which food is first taken in, then allowed to digest and finally the undigested food in released through anus.
From the given options, the structures included in the alimentary canal are (in the order)- Mouth- Pharynx- Esophagus- Stomach- Small intestine.
Mouth is the structure that ingests the food. Digestion begins in the mouth itself. It starts the digestion of carbohydrates through salivary amylase enzyme.
Pharynx is a muscular flap that aids the movement of food in the esophgus, which helps in the swallowing through peristaltic movements.
Stomach lies after esophagus. Protein digestion takes place in stomach.
Small intestine is a coiled tubular structure where complete digestion of food takes place. It is also the site of absorption of nutrients.
B. Old individuals outnumber juveniles in the population as it grows.
C. The resources available are fully used by the population as it grows.
D. Natural selection changes the gene pool of the population as it grows.
Answer:
The right answe is C.
Explanation:
The limit to how large any given population could be is defined by the concept of " carrying capacity". It refers to the fact that in nature populations grow much faster than resources do, and this impose a limit to population sizes (if there is no enough nutrition sources, the number of individual can not go up).
b: mitosis is not regulated in tumor cells
c: tumor cells use meiosis to replicate
d: there are no chromosomes in tumor cells
answer please
The correct option is: b. mitosis is not regulated in tumor cells. Cancer cells are malignant tumor cells and cancer is a disease of mitosis where the cell divides uncontrollably.
The tumor cells use mitosis to replicate and and cell cycle checkpoints are ignored so the mitosis is unregulated. So option c. tumor cells use meiosis to replicate is incorrect.
Tumor cells contain abnormal number of chromosomes so option d. is incorrect as it contains chromosomes.
Due to aneuploidy of tumor cells it cannot be specifically haploid or diploid so option a is incorrect.
The mitosis is not regulated in the tumor cell that makes it different from a normal cell. The other characteristics are cell shape, nucleus shape, chromatin, and growth rate, etc.that make it different from a normal cell.
Further Explanation:
The difference between normal cells and tumor cells are listed in table 1 attached below.
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Answer Details:
Grade: High School
Subjects: Biology
Topic: Cell growth and development
Keywords:
Tumor, cell, nucleus, chromatin, spheroid, controlled, aerobic, respiration, nucleations, coarse, hypoxic, metastasis.
B. copper and iron.
C. zinc and magnesium.
D. iron and zinc.
Answer:
Option A
Explanation:
The core of earth has two parts
a) Outer core – The outer core is made up of molten alloy of iron and nickel. However, it also has traces of dense materials like gold, platinum, and uranium etc. These materials are contained at a very high temperature i.e 9,000 and 13,000 degrees Fahrenheit.
b) Inner Core – It is composed of solid dense iron but the iron is not in its purest form. It has some impurities such as sulfur etc. It has temperature ranging between 7000 to 9000 degrees Fahrenheit and is responsible for earth's magnetic field.
Hence, option A is correct