Answer:
D. They live in freshwater, are free-living and reproduce sexually and asexually.
Explanation:
Most planarians are found in freshwater. Since they reproduce through fission, they reproduce asexually. However, since they are heteromorphic, they also reproduce sexually.
Attach to DNA molecules at specific sites and cut both strands of DNA at that place
OKAY IF IT HELP YOU PLZ PICKK AS BEST TNX
Skeletal and muscular systems
Answer: Nitrogen stays in the air.
Hope this helps! :D
-TanqR
(Please mark me as brainliest)