Which of these is a heterotroph? plant producer consumer phytoplankton

Indica el nombre y la fucion de los vasos sanguineos que entran y salen de los riñones

Hurry which of these is true about index fossils? a) are very scarcely found b) used as guides in relative dating c) found in the youngest layer of the rock d) used as reference points in absolute dating

As the human population grows, what happens to our natural-resource requirements? o they increase o they decrease o they do not change. they go in cycles