Assertion: echidna's egg | /r/HasProperty | fertilised by stored sperm
Facets:
Source sentences:
text: an egg is released after sex and fertilised by stored sperm.
text: How: Hormones released in response to sex cause the ovary to release an egg, which is fertilised by stored sperm.
text: an egg is released after sex and fertilised by stored sperm.
text: How: Hormones released in response to sex cause the ovary to release an egg, which is fertilised by stored sperm.