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Remote Ready Biology Learning Activities has 50 remote-ready activities, which work for either your classroom or remote teaching.
Additional resource re sex/gender/biology
A student in this year's biology senior seminar has put together a nice background page for a discussion of sex/gender categories starting with Eugenides' Middlesex and the Caster Semenya case and ending with issues of single sex education. We'll be talking through this material this afternoon and continuing the discussion in an on-line forum there. You're more than welcome to look in on that conversation, and add thoughts if you're inclined.