1) d. mitochondria
These are found in both plant and animal cells.
2) b. fluid
A. Sponges
They are multicellular organisms that have bodies full of pores and channels allowing water to circulate through them, consisting of jelly-like Mesohly sandwiched between two thin layers of cells. Sponges have unspecialized cells that can transform into other types and that often migrate between the main cell layers and the mesohly in the process. Sponges do not have nervous, digestive or circulatory systems. Instead, most rely on maintaining a constant water flow through their bodies to obtain food and oxygen and to remove wastes.
B. Stomata. These are the holes in leaves that gases pass through. So, while leaves have something to do with it, petals do not, so D is close but wrong answer.
Answer: D. Boats, Because, your not able to smell the carbon monoxide on boats, you can't smell it on planes, and you CAN smell it on trains so that rules 'C.' out. Your able to smell it on land vehicles, don't believe me? Stick your nose in the back of a car that's running. Your able to smell it in factories, because in China, individuals have to wear gas masks to go outside or walk to work.
Swimmer Teófilo Yldefonso, who finished the 200 meter breaststroke event.