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amphibian a small animal that spends part of its life cycle in water and part of its life cycle on land. Amphibians hatch in water and breathe with gills. Then they develop lungs so the adults can breathe air. Amphibians are cold-blooded animals with skeletons inside their bodies. Frogs, toads, and salamanders are amphibians. [1/2 definitions]
biennial having a life cycle of two years. [2/5 definitions]
cycle A cycle is what we call it when things happen in a certain order and then start again from the beginning. A cycle makes a kind of circle. [2/3 definitions]
life cycle the sequence of changes that a living thing goes through as it grows and develops. Birth, growth, reproduction, aging, and death are all stages in the life cycle of an animal.
new beginning or repeating as part of a cycle. [1/4 definitions]
perennial having a life cycle of more than two years as a plant. [1/4 definitions]
phase a particular stage in a cycle of development or process of change. [1/2 definitions]
revolution motion in orbit around a point, or one completed cycle of this orbiting motion. [1/4 definitions]
water cycle When we talk about the water cycle, we are talking about how water on the earth goes up into the sky and then comes down to earth again as part of rain or snow.