Why Do Some Invertebrates, Such as Lobsters, Show a "Stair-Step

question 17

Multiple Choice

Why do some invertebrates, such as lobsters, show a "stair-step" survivorship curve?

• A) Many invertebrates mate and produce offspring on multiyear cycles.
• B) Within a species of invertebrates, younger individuals have a higher survivorship than older individuals.
• C) Many invertebrates molt in order to grow, and they are vulnerable to predation during their "soft shell" stage.
• D) Many invertebrate species have population cycles that go up and down according to the frequency of sunspots.
• E) The number of fertilized eggs that mature to become females in many species of invertebrates is based on ambient temperature.

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