Answer:
mutualism and parasitism
Examples:
mutualism: crocodiles and birds
parasitism: mosquitoes and humans
A plan needs the sun and Carbon Dioxide
I’m not sure but I think it’s starch
Answer:
D, what do people need to be happy
Explanation:
first we need to understand what positive psychology means. Positive Psychology according to Wikipedia can be defined as <em>the scientific study of the "good life", or the positive aspects of the human experience that make life worth living. </em>
Therefore the correct option is D
Both. You can use it as singular or plural.
