1) Which of the following illustrates altruism? Parent birds clean out their nes

Question

1) Which of the following illustrates altruism?

Parent birds clean out their nest.
Birds of a different species care for a cuckoo egg.
A mother bird pretends to be wounded to distract a predator away from her young.
Parent birds spend much of their time and energy feeding their young.
Males sing to attract females as mating partners.

2) Which of the following characteristics makes vertebrates uniquely different from invertebrates?

vertebrates have paired appendages such as legs and wings
vertebrates have brains
vertebrates have an endoskeleton that holds them upright and provides an attachment place for muscles
vertebrates have a closed circulatory system

Explanation / Answer

1. Parent birds spend much of their time and energy feeding their young.

2. vertebrates have paired appendages such as legs and wings

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