Weegy: Invertebrates have only nonspecific immunity, which means immunity is inborn or innate.
User: The subunit (organelle) of the sperm that supplies the energy for motion is _____.
Weegy: The Mitochondria
User: Adrenal glands in males release _____, which are secreted during puberty.
User: The only invertebrates known to hear are _____.
User: During gastrulation, two openings form in most animals. If the first opening becomes the mouth, the animal is a deuterostomeprotostome.
Weegy: During gastrulation, two openings form in most animals. If the first opening becomes the mouth, the animal is a PROTOSTOME. [ ]
User: Many invertebrates die during the earlier stages of their life cycle because they are a major part of the food chain.
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