What is the outer covering of a leaf called? epidermis mesophyll stalk leaflet

Ineed to know why d is the correct answer asap

As a result of wildfires, in grasslands. a) tree growth increases b) grass growth increases c) soil quality decreases d) invertebrate variety decreases

Which term describes a normal value for something in the body? a.homeostasis b.set point c.feedback loop d.integration center