The phrase 'these three orders' is correct and usable in written English.
It can be used to refer to a set of three orders that are being discussed, either when making a list or when mentioning them in a more general context. For example, "We cannot fulfill these three orders until we receive more supplies."
These three orders of living amphibians are thought to derive from a single radiation of ancient amphibians, and although strikingly different in body form, they are probably the closest relatives to one another.
Asparagales, the largest and taxonomically most diverse of these three orders, is characterized by possessing seeds with a distinctive outer layer containing phytomelan, a carbonaceous substance causing the dense black coloration of the seeds, although this feature is not universal in the order.
The three levels are closely linked to one another; and through these three orders, the divine Creator exerts his power, which passes from rank to rank, from the purely spiritual angels occupying the highest level, which is closest to God, down through celestial bodies, especially the planets, and on to the lowest rank of material beings, both living and inanimate.
These three orders make up the clade Euarchonta.
These three orders are quite morphologically distinct and diverged 40 50 million years ago [38]; therefore, this correlation between phylogenetic relationship and similarity in morphological integration is perhaps expected.
The rearrangements are different within these three orders, being rather extreme in the Thysanoptera.
Because there have been few studies investigating the morphological dynamics of vegetative cells, whether these three ordered patterns are common to different developmental stages or specific only to starved Dictyostelium cells remains to be determined.
In order of precedence among knights, Knights of the Garter are ranked above Knights of the Thistle, these two orders being the oldest and most honoured in Britain.
These anatomic dissimilarities are thought to reflect important differences in muscle arrangements in the hips and hind legs of these two orders.
About this time he wrote the Principes de la nature et de la Grâce fondés en raison, which inaugurated a kind of preestablished harmony between these two orders.
In order of precedence among knights, Knights of the Thistle are ranked just below Knights of the Garter, these two orders being the oldest and most honoured in Britain.
