Allah says:

[وَمِنْ ءَايَـتِهِ]

(And among His Ayat) the signs which point to His great might and power,

[خَلْقُ السَّمَـوَتِ وَالاٌّرْضِ وَمَا بَثَّ فِيهِمَا]

(is the creation of the heavens and the earth, and whatever moving creatures He has dispersed in them both.) means, whatever He has created in them, i.e., in the heavens and the earth.

[مِن دَآبَّةٍ]

(and whatever moving creatures) this includes the angels, men, Jinn and all the animals with their different shapes, colors, languages, natures, kinds and types. He has distributed them throughout the various regions of the heavens and earth.

[وَهُوَ]

(And He) means, yet despite all that,

[عَلَى جَمْعِهِمْ إِذَا يَشَآءُ قَدِيرٌ]

(is Able to assemble them whenever He wills.) means, on the Day of Resurrection, He will gather the first and the last of them, and bring all His creatures together in one place where they will all hear the voice of the caller and all of them will be seen clearly; then He will judge between them with justice and truth.