The smallest unit that retains the properties of an element is an atom. Everything below that doesn't retain any properties.
Info:
Well, I do not know where you got that information from, but, it is true. Physics is a branch of science that studies something that is quite far from biology. Chemistry though, shares a lot of common studies though, and many times they depend on each other.
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Comparison:
Physics: studies the behaviour of the universe, to keep it simple.
Chemistry: it's the study of matter and their properties/interactions.
Biology: studies life.
As you can see, the studies of physics cannot be used frequently while studying biology. But, the study of matter can really be helpful to the study of life because they're really related.
Hope it helped,
BioTeacher101
Answer: interspecific association
Explanation:
Interspecific relationship or interspecific association is called the interaction between 2 or more individuals of different species, usually ecosystems establish relationships to support the feeding of different populations, they can be beneficial or harmful.