Which organelle can be compared to a security guard who decides whom may enter a building and whom may not?
O cell membrane
O cytoplasm
O endoplasmic reticulum
O mitochondrion

What have we learned from fossil evidence about evolution? a) it is an abrupt change. b)the process is observable. c) it takes place during one lifetime only. d)the most complex traits are always selected.

What molecules will be best used to compare different species with the exact same sequence of amino acids? why would two species have the same protein even if the molecules in question is different? (hint: transcription to translation to protein).

How water is moving through the ecosystem ?