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Answer:

Across
3A shelled, water-retaining egg that allows reptile, bird, and certain mammal embryos to develop on land
4A poison that attacks the nervous system, causing blindness, _____ or suffocation
5A structure that allows an embryo to be nourished with the _____ blood supply
Down
1Down _____
2A poison that attacks the red blood cells and blood _____, destroying circulation
 
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