The major reason birds migrate is:
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Which best describes the sea star’s nervous system?
Which best describes the sea star’s nervous system?
Which of the following is a characteristic of all insects?
Which of the following is a characteristic of all insects?
Grey whales have the heaviest parasite load of all whales. T…
Grey whales have the heaviest parasite load of all whales. This is in part due to its:
______ have highly efficient circulatory systems, and comple…
______ have highly efficient circulatory systems, and complex nervous system and sensory organs.
Bacteria reproduce by ————-
Bacteria reproduce by ————-
Sessile animals…
Sessile animals…
Planarians
Planarians
The only amphibians to entirely escape dependence on aquatic…
The only amphibians to entirely escape dependence on aquatic habitats are _____.
Single-celled photosynthetic protistans, including most of t…
Single-celled photosynthetic protistans, including most of the euglenoids, chrysophytes, and dinoflagellates, are members of the _____ , the “pastures” of most aquatic habitats.