Answer: Hairlessness and Glands
explanation:Another notable similarity between the two groups is minimal hair. Both hippos and whales possess barely any hair on their bodies. They do not have sweat glands, either. These are both characteristics that can assist them in their aquatic lifestyles.
Leaves and grass serve to collect energy from the sun, through photosynthesis. Chlorophyll in the leaf gives the grass its green color.
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Erosion of the esophagus.
