Structures, Functions, and Life Cycles

a characteristic that helps animals blend in with the surrounding environment and increase their chances of survival

• camouflage

• characteristic

• individual

• mate

a feature that helps identify something

• camoflague

• characteristic

• individual

• mate

a new organism produced by two parents

• offspring

• predator

• species

• survival

the process of staying alive and in existence

• predator

• species

• survival

• variations

At which stage in the life cycle of a plant are seeds produced? (3.10B)

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The life cycles of a butterfly and a chigger are shown. HOw is the life cycle of chiggers different from the life cycle of butterflies? (3.10B)

• Chigger larvae have legs.

• Chiggers have a nymph phase.

• Chiggers go through metamorphosis.

• Chigger larvae hatch from eggs.

Some species of rain forest frogs reproduce in the moist leaf litter on the forest floor. These frogs do not need a nearby body of water to complete their life cycle. Which stage of the typical frog life cycle is most likely missing from their life cycle? (3.10B)

• Egg

• Tadpole

• Froglet

• Adult frog

Some students are investigating the life cycle of the spotted salamander. They learn that these salamanders must live close to water and lay their eggs in water. After 20-60 days the eggs hatch as larvae that must stay in the water until they mature into adult salamanders. The students infer that the life cycle of the spotted salamander is similar to the life cycle of the frog because both animals---- (3.10B)

• have long tails and strong jumping legs as adults

• live near water and produce larvae with wings

• lay eggs in water, which hatch into larvae that live in water

• produce offspring that hatch from eggs and look like adults

One stage in the life cycle of an apple tree is the release of seeds. Which of these animal activities is most like the stage of the life cycle in which seeds are released? (3.10B)

• A snake shedding its skin

• A bird laying an egg

• A swarm of bees leaving a hive

• A tadpole growing into an adult

The abalone is a type of sea snail. Adult abalones slowly crawl over rocks near the shore, while larvae float in the water. Which organisms have a life cycle that is most like that of abalones? (3.10B)

• Humans

• Frogs

• Birds

• Snakes