- former term for endoderm
- ‘Why is the origin of mesoderm from hypoblast in some groups not regarded as a secondary adaptation?’
- ‘Why then, asks Balfour, are hypoblast and epiblast continuous?’
- ‘The prospective endoderm displaces the hypoblast and the mesoderm forms a layer between ectoderm and endoderm.’
We take a look at several popular, though confusing, punctuation marks.