Weegy: (a)producing spores
User: A unique characteristic of mammals is that they _____.
User: A unique characteristic of mammals is that they _____.
have hair
have a four-chambered heart
have both aquatic and terrestrial
Weegy: have hair
User: Gram-negative bacteria have a cell wall that is thinnerthicker and does not accept the stain, making it appear bluepink .
Weegy: What is your question then?
User: The huge redwood trees in Oregon continue to grow tall by conducting secondaryprimary growth
Weegy: Do you have any options?
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