Answer:
Epidermal cells secrete the waxy hydrophobic substance cutin that polymerizes on the surface, forming a barrier to water evaporation. Epidermal cells are transparent because their plastids remain small and undifferentiated; hence light readily penetrates through to the photosynthetic tissues beneath the epidermis.
Explanation:
The heart has 4 chambers.
prokaryotic cells do not have a nucleus.
Answer:
D
the skeletal system provides protection for the brain and spinal cord
