mixed forest (forest composed of more than one species of tree)

an ecosystem (system of an ecological community and its environment)

a seed / a pit or stone in a fruit / a gamete (reproductive cell such as a spermatozoan or egg) / a lineage, bloodline / an origin, cause / the materials or ingredients from which something is made

(ecology) biodiversity

get stuck, get jammed

support / hold in check / provide for, maintain, support

mix up

a mixture of various things; mixture, blending

important, significant

importance, consequence, significance