9. Why is the law of conservation of mass true? a. All atoms at the start of a chemical reaction are present at the end of the reaction.
b. All the molecules in a substance remain intact during a chemical reaction.
c. The substances at the start of a chemical reaction gather more atoms to make up
for those lost in the reaction.
d. All molecules at the start of a chemical reaction are present at the end of the
reaction

I think it's D but I'm not too sure. Let me know if it's correct !

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.

that would be called plucking : )

explanation:

''plucking, also referred to as quarrying, is a glacial phenomenon that is responsible for the erosion and transportation of individual pieces of bedrock, especially large "joint blocks". as a glacier moves down a valley, friction causes the basal ice of the glacier to melt and infiltrate joints (cracks) in the bedrock."