1. (noun) passing from a more complex to a simpler biological form

• degeneration

2. (noun) returning to a former state

• regress
• regression
• retroversion
• reversion

1. (noun) passing from a more complex to a simpler biological form

• abiotrophy
• cataplasia

1. (noun) passing from a more complex to a simpler biological form

• shift
• transformation
• transmutation

2. (noun) returning to a former state

• reversal

1. (noun) returning to a former state

• regress
• retrograde
• retrogress
• regress
• regress
• regress
• regress
• retrovert
• retrovert
• retrovert
• retrovert
• return
• return
• return
• return
• revert
• revert
• revert
• revert
• turn back
• turn back
• turn back
• turn back