Explanation:
<em>option b</em><em>)</em><em> </em><em>they can't make their own food</em>
I'll include the link so you can find some answers on there :) https://quizlet.com/136508585/planet-earth-freshwater-flash-cards/
If this one doesn't include all of the answers, just google the name of your worksheet and there will most likely be a Quizlet on it. If not, google one question from the worksheet and you may come across a Brainly or Yahoo question with other questions (and answers) included. Good luck!!
Answer:
During swallowing, a cartilagenous flap called epiglottis closes the entrance of wind pipe.
Explanation:
Once upon a time, there was a cell. It was moving around the primordial soup trying to make it in that harsh world. All of a sudden, it encountered a small prokaryotic cell. To be honest, the cell was feeling a little lonely and it was happy to come across somebody to share the habitat with. The two cells started spending a lot of time together, just quietly coexisting. The first cell started thinking how it would be so much easier to survive if the other, small cell were to live with me. I could provide safety and shelter, and the small cell can pay me back by providing me with the energy I need for my daily metabolic processes. The cell was hesitant for a second, but then bravely said ''Hey, what do you think about symbiosis?''. And the rest is (endosymbiotic) history.
