What structure is common to all five kingdoms of living organisms?
a. dna
b. nucleus
c. cell wall
d. mitochondria
i know it is not c-cell wall.

Which statement describes characteristics of planarians? a they live in oceans, are parasites, and reproduce only sexually. b they live in fresh water, are parasites, and reproduce only asexually. c they live in oceans, are free living, and reproduce sexually and asexually. d they live in fresh water, are free living, and reproduce sexually and asexually.

All ova contain sex chromosomes corresponding to: x y xx xy

Explain how light energy is turned into chemical energy? ! due tomorrow!