Could there be a good chain without herbivores and carnivores

yes, there can be a chain without carnivores

No there could not be a good chain without the herbivores or carnivores

atp is used for energy.

ans.

gregor john mendel is known for study of inheritance in pea plants. he used garden pea plant for his study, having alternative traits for various characters. he performed cross-breeding in pea plants to check how characters are transmitted between parents to offspring, such as cross between pure tall and pure dwarf plant. mendel studied the inheritance patterns in pea plants for various generations.

thus, the correct answer includes options and f).