Which statement about ecosystems is false? a. bacteria recycle nutrients through decomposition. b. in the process of energy conversions within an ecosystem, some energy is converted to heat. c. chemical nutrients cycle within an ecosystem. d. plants and other photosynthetic organisms are producers in ecosystems.

Option C, Chemical nutrients cycle within an ecosystem.

Explanation:

Chemical nutrient cycle does not necessarily take place only with single ecosystems. It however inclusively links with several ecosystems at a time. For example a water cycle involves interaction between different spheres of the earth's atmosphere involving both biotic and abiotic components such as rivers, lakes, rain etc. Likewise oxygen, nitrogen and carbon cycle also circulates through a food web involving several food chains, and atmospheric spheres.  

While all other options are correct as in all ecosystems plants and green chlorophyll containing species acts as producer, some portion of energy is converted and lost as heat while energy is transferred from one trophic level to other and in every ecosystem, microbes such as bacteria decompose dead organic material into useful minerals.  

Option C is correct

1 digestive system

2 stomach

3 bladder

4 carbon deoxide

5 tiger