Biology, 28.08.2019 09:00 naomirice24

Why were the scientists concerned about the glue used to reattach the barn swallows’ tails?
a)they thought its smell might keep females away.
b) they were worried it might hurt the birds.
c) they did not know if it would hold the tails in place very long.
d) they were afraid it could not be removed.

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