My apple tree seedlings are dying and I don't know why.

Jeanie Tymchak
by Jeanie Tymchak
I started these seedlings by placing apple seeds in a damp paper towel in a plastic bag in the refrigerator. After a few months, they were sprouted so I planted them in pots. Now they are about 3 inches tall and they are starting to die. Does anybody know what could be causing this. I planted 24 seedlings and I am down to 17 with about 4 more looking sickly.
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