The Living World

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Name two scientists who made significant contributions to the field of microbiology.

Louis Pasteur and Edward Jenner

What are the three lines of defense in the immune system?

The three lines of defense in the immune system are the physical and chemical barriers, the innate immune response, and the adaptive immune response.

Define the term 'pandemic'.

A pandemic is an outbreak of a disease that occurs over a wide geographic area and affects an exceptionally high proportion of the population.

Explain the difference between infectious and non-infectious diseases.

Infectious diseases are caused by pathogens, such as bacteria or viruses, and can be transmitted from person to person. Non-infectious diseases are not caused by pathogens and cannot be transmitted from person to person. Signup and view all the answers

What are the three types of organisms in an ecosystem and what role do they play?

The three types of organisms in an ecosystem are producers, consumers, and decomposers. Producers, such as plants, produce food through photosynthesis. Consumers, such as animals, obtain energy by consuming other organisms. Decomposers, such as bacteria and fungi, break down dead organisms and recycle nutrients. Signup and view all the answers

Which theory proposes that the universe has always existed and is in a constant state of creation?

Steady state theory (C) Signup and view all the answers

What is the process by which the age of rocks and fossils is determined using the decay of radioactive isotopes?

Radioisotope dating (A) Signup and view all the answers

Which type of electromagnetic radiation is used in radio and optical telescopes to observe celestial objects?

Radio waves (C) Signup and view all the answers

What is the term for the movement of Earth's lithospheric plates, resulting in the formation of mountains, earthquakes, and volcanic activity?

Plate tectonics (D) Signup and view all the answers

Pandemic

A disease outbreak that spreads widely across geographical regions and affects a significant portion of the population.

Steady State Theory

This theory suggests that the universe has always existed and is continually being created throughout time, maintaining a constant overall density.

Radioisotope Dating

The process of determining the age of rocks and fossils by analyzing the decay of radioactive isotopes within them.

Plate Tectonics

The movement of Earth's lithospheric plates, causing various geological events such as mountain formation, earthquakes, and volcanic activity.