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What is a pathogen?

A pathogen is a microorganism that causes a disease. Pathogens spread communicable diseases meaning that they are transmitted person to person and are infectious. Types of pathogens include bacteria, fungi, ...
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Answered by Francesca D. • Biology tutor
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How can bacteria become resistant to antibiotics and how can doctors reduce the number of bacteria that become resistant?

-A mutation in a pathogen may produce a new strain. This new strain may become resistant to an antibiotic through natural selection . The new strain may spread rapidly as the individual is not immune to it a...
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Answered by Helen C. • Biology tutor
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What does an organism use energy from respiration for?

In all organisms, allows creation of bigger molecules from smaller ones In animals, enables muscle contraction In some animals (mammals and birds), provides heat to maintain a constant body temperature In pl...
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Answered by Bertie H. • Biology tutor
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Explain how natural selection can lead to new species forming (speciation)

Within a gene pool of a population, there is genetic variation, due to mutation. This leads to phenotypic variation. Some individuals will be better adapted to the environment than others and will therefore ...
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Answered by William D. • Biology tutor
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What is natural selection?

Within a population of a species there is great geetic variation giving rise to variation in their phentoypes. Some phenotypes enable an organism to be better adapted to its environment than other members of...
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Answered by Sabrina A. • Biology tutor
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