Think back about your experience in this lab using a dichotomous key. what might make it hard for someone to use a dichotomous key? make a list of possible reasons.

i'd say that the moon rock is about 2.2 billion years old.

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.

but there is no

i guess you forgot putting it.