8. Which technique involves the use of radioactivity and how does it support evolution by natural selection??

the correct answer is option b

behavioral response need communication and thus co-ordination at several levels such as interaction among cells, organ system and the entire organism.

behavioral response produces both internal and environmental stimulus.

the "dirty dozen" chemicals banned in an international treaty are formally known as persistent organic pollutants, or pops. the united nations environment program provided this background on what they are and what they can do to humans and wildlife.

i hope this

i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.