Which of the following is one of the five causes of a business cycle?a. decrease in consumer demand
c. recession
b. external shocks
d. none of the above

The molecule responsible for heredity, which encodes and transmits information in organisms is DNA. Therefore, the correct statement is option A.

What are the positive impacts of the discovery of DNA?

In the 1940s and 1950s, scientists such as Avery, MacLeod, McCarty, Hershey, and Chase demonstrated that DNA was the genetic material. When DNA was damaged, the genetic information was not passed on, and also when DNA was introduced to a cell, it could change the characteristics of the cell.

This discovery was a breakthrough, and also led to the development of new technologies, which allow scientists to manipulate or modify DNA for other applications.

The discovery that DNA explained how genetic information is inherited from one generation to the next generation. This discovery also leads to important breakthroughs in medicine, agriculture, and biotechnology by developing treatments for genetic diseases and creating genetically modified crops.

Therefore, DNA is the molecule responsible for heredity, which encodes and transmits information in organisms.

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Answer: B. to reduce water loss from leaves in dry climate.

Explanation:

Spiny or needle shaped leaves is a kind of adaptation in plants which is typically seen in plants that survive in dry climatic conditions. The needle shaped leaves reduces the surface area of the leaves which prevents the loss of water through transpiration.

Answer:A

Explanation:

The four body systems that interact to allow a person to sneeze are the muscular system, immune system, nervous system, respiratory system (Option A).

• Sneezing can be defined as an involuntary expulsion of air that helps to remove irritant particles from the nose and/or throat.

• In the first place, the brain (i.e., the nervous system), when the respiratory epithelium (i.e., the respiratory system) is irritated, the endings of the cranial nerve sends a signal message to the brain to induce a sneeze reflex.

• The muscles involved in sneezing include the chest muscles, abdominal muscles, diaphragm, and muscles that control vocal cords.

• Sneezing is a fundamental immune response aimed at clearing the respiratory system of harmful pathogenic microorganisms (e.g. bacteria) and viruses.

In conclusion, the body systems that interact to allow a person to sneeze are the muscular system, immune system, nervous system, respiratory system (Option A is correct).

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Answer:

A

Explanation:

Muscular, immune, nervous and respiratory systems are involved in the process of sneezing. Sneezing is the natural defense mechanism of the human body. When any foreign particle enters the respiratory system then it irritates the respiratory epithelium and sends a signal to the brain through the 5th trigeminal nerve and sneezing reflex starts which involved skeleton muscles and respiratory system.