Help me Please Does anyone know the words that I can possibly use to fill out the definitions?

Deer cave cannot support photosynthesis is as not enough sunlight is present. in spite of this, it still has a complex food chain. what is the energy foundation of this food chain?

The biological classification of organisms is called taxonomy. based on your own investigation, discuss the importance of taxonomy in biological ?

Based on their relative positions in the periodic table, which two elements would have the same number of valence electrons?