What temperature is the sand at midnight? (Example: Temperatures coolest, Possibly over 120º!)

At night, desert temperatures fall to an average of -3.9°C (about 25°F).

Explanation:

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Embryological evidence

Explanation:

Deuterostomes is a group that includes echinoderms, hemichordates, and chordates. Although these animals exhibit a wide variety of body plans, they share a mouth secondarily formed during embryo development, which it is believed to be an evolutionarily derived character present between a common ancestor and all its descendants (i.e., a synapomorphy). This oral cavity is formed by the invagination of the ectoderm layer opposite to the blastopore of the gastrula.