food webs are more reallistic because they have all of the populations of animals.
2. direct sunlight
Cacti gets eaten by insects and birds. snakes eat the birds and some lizards. lizards eat insects and hawks eat lizards and snakes
carrying capacity is the limit of the species that lives in an area
A limiting factor is if a wild fire comes and destroys there shelter so some of the snakes die out so the population goes down.
cactis are producers