Apex domains cannot have CNAME records.
Question and response
Question
dig wooilbio.com. NS
Answer
wooilbio.com. 5 NS ns-363.awsdns-45.com.
wooilbio.com. 5 NS ns-1348.awsdns-40.org.
wooilbio.com. 5 NS ns-401.awsdns-50.com.
wooilbio.com. 5 NS ns-1978.awsdns-55.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0