Nervous, circulatory, integumentary, muscular, skeletal systems
<span>There are five environmental factors are used to create an attractive environment is,
competitors, threat of entry, substitutes, suppliers, customers.
These are the main factors that help to determine how attractive or unattractive an environment.</span>
Producers bring energy into the ecosystem by making organic molecules from sunlight or chemical compounds. Producers bring new energy into an ecosystem by breaking down inorganic materials and making new ones.
Creo que es el estómago y los intestinos. ¡Espero eso ayude! :)