<span>Teratogens are catalysts that can cause birth defects in fetuses. The threshold effect means that this agent is virtually harmless until exposure to it reaches a toxic level, or in some cases would affect the fetus if it was at a lower birth weight, or if a pregnant mother fails to gain sufficient weight during the pregnancy or may be simply be harmful to some organs if exposure occurred at a time when those organs were developing.</span>
The meaning of spunky is: plucky or spirited.
Answer:
I feel mad about it i just dont like it
Explanation: