What are the two reasons for the change in the population of the giraffes?

Explanation:

Giraffe numbers plummeted by a staggering 40% in the last three decades, and less than 100,000 remain today. Habitat loss through expanding agriculture, human-wildlife conflict, civil unrest, and poaching for their meat, pelts, and tails, are among the reasons for the decline.

they are known to reach a speed of 21 miles per hour

a tetrad is the foursome during meiosis made by two homologous chromosomes that have each already replicated into a pair of sister chromatids.