Protists are a diverse collection of organisms. While exceptions exist, they are primarily microscopic and unicellular, or made up of a single cell. The cells of protists are highly organized with a nucleus and specialized cellular machinery called organelles.
A <u>pathogen</u> is made up of nonliving pieces of DNA or RNA wrapped in a protein shell.
Air quality has an impact on the health of our lungs and the entire respiratory system. The cells of the lung tissue can be damaged by air pollutants such as ozone, metals and free radicals. Ozone can cause damage to the alveoli - air sac in the lungs where exchange of oxygen and carbon dioxide is produced.
The one that does not belong together is : A. Structuralism ; observable behavior
Structuralism interpret the aspect of human cognition that couldn't be directly observed ( such as personal conscience)
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The process is fertilisation. Hope this helps you.