The biosphere and its ecosystems are made up of components.

a. self-feeding and dependent

b. autotrophic and oligotrophic

c. molecular and cellular

d. productive and nonproductive

e. biotic and abiotic

the answer is d (apex) good luck : ))

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 tricuspid valve is present between right atrium and right ventricle