Aloysium:
Aquinas did not have the knowledge we have today about the workings of nature, but he did talk about a vegetative and animal soul, which we also possess in addition to our spiritual soul.
The great thing about people who are out to criticize what one says, is that they keep us on our toes.
I suppose it boils down to how we interpret his Summa Theologiae, remembering to do so within the context of what the words mean today outside the Aristotelean framework in which he operates.
Whence we must conclude, that there is no other substantial form in man besides the intellectual soul; and that the soul, as it virtually contains the sensitive and nutritive souls, so does it virtually contain all inferior forms, and itself alone does whatever the imperfect forms do in other things. The same is to be said of the sensitive soul in brute animals, and of the nutritive soul in plants, and universally of all more perfect forms with regard to the imperfect.
I should have said, instead, “he did talk about a vegetative and animal soul, whose qualities we also possess in our spiritual soul.” This would be based on the current understanding of what constitutes matter, that is atoms and molecules, which I would say are organized by the particular soul, expanding its meaning to include the kind of thing something is, like a feline or a grass.