Sponges

Sponges

Invertebrates are animals without a backbone. They are the most numerous animals on Earth. Most invertebrates are insects. However, simpler invertebrates evolved before insects.

CK-12 (High School)

ESSENTIAL QUESTION:

STANDARDS:
RST.1 - Analysis & Evidence, RST.2 - Main Ideas

DEPTH OF KNOWLEDGE (DOK) LEVELS:

3
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