Can you please rewrite this in your own words: Living things must be capable of transporting nutrients, wastes, and gases to and from cells. Single-celled organisms use their cell surface as a point of exchange with the outside environment. Multicellular organisms have developed transport and circulatory systems to deliver oxygen and food to cells and remove carbon dioxide and metabolic wastes. Sponges are the simplest animals, yet even they have a transport system. Seawater is the medium of transport and is propelled in and out of the sponge by ciliary action. Simple animals, such as the hydra and planaria (shown in Figure 1), lack specialized organs such as hearts and blood vessels, instead of using their skin as an exchange point for materials. This, however, limits the size an animal can attain. To become larger, they need specialized organs and organ systems.

Living things are made up of Unicellular and Multicellular organisms and they have the ability to transport nutrients, waste and gases between cells. Unicellular cells used their cell surfaces to do so with the surrounding environment while Multicellular cells use their circulatory system to do so within their cells. Even sponges, the simplest of animals, have a transport system. Seawater is the main form of transportation and propels in and out of the sponge by ciliary action. Simple animals such as the hydra and the planaria lack specific organs such as hearts and blood vessels, instead of using their skin to exchange for nutrients and waste with the surroundings. This, however, limits the size it can attain. To grow larger, they need specific organs and organ systems.

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answer: metephor

explanation:

i think the answer is d.