"When you're curious, you find lots of interesting things to do. " - Walt Disney
Question #93441 posted on 12/29/2020 1:02 p.m.
Q:

Dear 100 Hour Board,

What species still alive today has remained evolutionarily unchanged the longest?

(I'll leave it to you to define words like "species" and "unchanged.")

-My guess is some kind of crustacean?

A:

Dear Immutable,

I would guess something like tis guy, the Antarctic glass sponge.

 _96445913_20110401_rov_antxxvii_3_benthos_ews_tlundalv_p.jpg

According to the article from which I've borrowed an image, they have a lifespan of around 15,000 years. Alligators have also been around a long time.

-Inklings