Bilateral

... bottom-dwelling animals before the end of the [Vendian]. Nevertheless, although recent discoveries have greatly extended the record of sponges and bilateral animals, the earliest unequivocal paleontological evidence of metazoan life is no more than 600 Ma (Bromham et al. 1998, p. 12386). The nature ...

See entire post

... acoelomates. The reason they are classified so, however, is because they may have a distant ancestor that links radially symmetric animals with bilateral ones. They share similar ribosomal RNA. It is thought that evolution simplified their body plan as time progressed. I am not sure if this ...

See entire post

... think at stretch shortening cycle -drive to motoneurons from the motor cortex -various spinal cord connection plasticity, though to influence bilateral facilitation / bilateral deficit. those thing affect expression of strength in unilateral vs bilateral movements executed with homologous ...

See entire post

It's such a basic step that I'm not sure how it's relevant - you kind of need bilateral symmetry to get centralized anterior brains in the first place, but that's many many many steps backward on our family tree. It's the evolution of brains, period, which I guess ...

See entire post

Hello everyone, I have just finished studying invertebrates, and have learnt the importance of bilateral symmetry and the affect on aggregation of neurons at the head end of organisms. SO I've been thinking (yikes my biology wheels are turning!) obviously this change from ...

See entire post