These research units on sea creatures are perfect for emergency sub plans, individual research, home school, summer school, enrichment, or a science unit on ecosystems and the effect of humans on the environment. With a clear lesson outline and specific directions on each page, it's perfect to leave behind or set students up to work on, with meaningful practice in reading, writing, math, science, and social studies.This all-inclusive and ready-to-print bundle gives you 4 units for the price of 3