Cancer is the uncontrolled growth of abnormal cells in the body. Cancerous cells are also called malignant cells. Symptoms of cancer depend on the type and location of the cancer. Cancer grows out of normal cells in the body. Normal cells multiply when the body needs them, and die when the body doesn’t need them. Cancer appears to occur when the growth of cells in the body is out of control and cells divide too quickly. It can also occur when cells forget how to die. The most common cause of cancer-related death is lung cancer.

Correct Option: A

Cancer is the uncontrolled growth of abnormal cells in the body. Cancerous cells are also called malignant cells. Symptoms of cancer depend on the type and location of the cancer. Cancer grows out of normal cells in the body. Normal cells multiply when the body needs them, and die when the body doesn’t need them. Cancer appears to occur when the growth of cells in the body is out of control and cells divide too quickly. It can also occur when cells forget how to die. The most common cause of cancer-related death is lung cancer.

Jonas Edward Salk was an American medical researcher and virologist, best known for his discovery and development of the first polio vaccine. The field trial set up to test the vaccine developed by Salk and his research team was the most elaborate program of its kind in history, involving 20,000 physicians and public health officers, 64,000 school personnel, and 220,000 volunteers,” with over 1,800,000 school children participating in the trial. On April 12, 1955, Dr. Thomas Francis, Jr., of the University of Michigan, the monitor of the test results, “declared the vaccine to be safe and effective.”

Correct Option: A

Jonas Edward Salk was an American medical researcher and virologist, best known for his discovery and development of the first polio vaccine. The field trial set up to test the vaccine developed by Salk and his research team was the most elaborate program of its kind in history, involving 20,000 physicians and public health officers, 64,000 school personnel, and 220,000 volunteers,” with over 1,800,000 school children participating in the trial. On April 12, 1955, Dr. Thomas Francis, Jr., of the University of Michigan, the monitor of the test results, “declared the vaccine to be safe and effective.”

Hearing range usually describes the range of frequencies that can be heard by an animal or human, though it can also refer to the range of levels. In humans the audible range of frequencies is usually said to be 20 Hz (cycles per second) to 20 kHz (20,000 Hz), although there is considerable variation between individuals, especially at the high frequency end, where a gradual decline with age is considered normal. Specifically, humans have a maximum aural range that begins as low as 12 Hz under ideal laboratory conditions, to 20 kHz in most children and some adults, but the range shrinks during life, usually beginning at around the age of 8 with the higher frequencies fading. Inaudible sound waves can be detected (felt) by humans through physical body vibration in the range of 4 to 16 Hz.

Correct Option: C

Hearing range usually describes the range of frequencies that can be heard by an animal or human, though it can also refer to the range of levels. In humans the audible range of frequencies is usually said to be 20 Hz (cycles per second) to 20 kHz (20,000 Hz), although there is considerable variation between individuals, especially at the high frequency end, where a gradual decline with age is considered normal. Specifically, humans have a maximum aural range that begins as low as 12 Hz under ideal laboratory conditions, to 20 kHz in most children and some adults, but the range shrinks during life, usually beginning at around the age of 8 with the higher frequencies fading. Inaudible sound waves can be detected (felt) by humans through physical body vibration in the range of 4 to 16 Hz.

The Olive Ridley is considered the most abundant sea turtle in the world, with an estimated 800,000 nesting females annually. The Olive Ridley gets its name from the olive coloration of its heart-shaped top shell (carapace). The Olive Ridley has one of the most extraordinary nesting habits in the natural world. Large groups of turtles gather off shore of nesting beaches. Then, all at once, vast numbers of turtles come ashore and nest in what is known as an “arribada”. During these arribadas, hundreds to thousands of females come ashore to lay their eggs. The Olive Ridley turtles are the smallest and most abundant of all sea turtles found in the world, inhabiting warm waters of the Pacific, Atlantic and Indian oceans.

Correct Option: B

The Olive Ridley is considered the most abundant sea turtle in the world, with an estimated 800,000 nesting females annually. The Olive Ridley gets its name from the olive coloration of its heart-shaped top shell (carapace). The Olive Ridley has one of the most extraordinary nesting habits in the natural world. Large groups of turtles gather off shore of nesting beaches. Then, all at once, vast numbers of turtles come ashore and nest in what is known as an “arribada”. During these arribadas, hundreds to thousands of females come ashore to lay their eggs. The Olive Ridley turtles are the smallest and most abundant of all sea turtles found in the world, inhabiting warm waters of the Pacific, Atlantic and Indian oceans.

When molten nuclear fuel melts through a nuclear power plant’s barriers, it causes a serious radiation leak. The radioactive materials will seep out to the surrounding environment, and into the air. Once in the upper atmosphere, high winds and jet streams could carry the dust to all places, and dropping radiation on everything, causing radiation poisoning. Radiation can penetrate deep inside the human body, and into the cells. Certain body parts are more specifically affected by exposure to different types of radiation sources. The areas of skin exposed to radiation will appear like severe sunburn, then sores may form, and skin infection may develop.

Correct Option: C

When molten nuclear fuel melts through a nuclear power plant’s barriers, it causes a serious radiation leak. The radioactive materials will seep out to the surrounding environment, and into the air. Once in the upper atmosphere, high winds and jet streams could carry the dust to all places, and dropping radiation on everything, causing radiation poisoning. Radiation can penetrate deep inside the human body, and into the cells. Certain body parts are more specifically affected by exposure to different types of radiation sources. The areas of skin exposed to radiation will appear like severe sunburn, then sores may form, and skin infection may develop.