When abiotic and biotic things in an environment it is called an ecosystem.

a) interact

b) interrupt

c) interfere

The answer is "A. interact"

Explanation:

This is the only answer that makes sense and flows well with the rest of the sentence.

If you try and put each of the words in the blank you'll find only 'A' makes sense

B). When abiotic and biotic things interrupt in an environment it is called an ecosystem. (this doesn't make sense)

C). When abiotic and biotic things interfere in an environment it is called an ecosystem. (I feel as if it is more of an interaction than a interference)

A). When abiotic and biotic things interact in an environment it is called an ecosystem. (this is the only phrase that truley makes sense with the rest of the sentence)

individual oxygen atoms are formed during photosynthesis.-c.

a tetrad is the foursome during meiosis made by two homologous chromosomes that have each already replicated into a pair of sister chromatids.