First of all, the basic lifestyle of Nepenthes is absolutely autotrophic, and photosynthesis is carried out through chloroplasts in vivo, which provides the basic conditions for survival in an autotrophic way.

Secondly, Nepenthes can prey on insects and small animals for heterotrophic life, but this heterotrophy only uses biological enzymes to digest small animals to obtain protein and some necessary organic matter.

Then, Nepenthes will never survive if they only prey on insects and small animals without photosynthesis.

There is no heterotrophy, only autotrophic can survive, but the nutrition is insufficient.

Take both into account, and you will be developed. ..................................