Dr. Grant is conducting an experiment to see if female cockatoos of a certain species prefer males with red feathers on their heads. In her experiment, she paints the feathers on several male cockatoos' heads four different shades of red. She then releases the painted cockatoos and monitors how many females each male attracts.
Question: What's wrong with Dr. Grant's experiment?

a.) she did not release any normal cockatoos and monitor them.
b.) she did not test multiple males.
c.)s he did not monitor the painted cockatoos after they were released.

a.she did not release any normal cockatoos and monitor them.

Explanation:

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

answer : haversian

[explanation: -(compact bone is organized as parallel columns, known as haversian systems, which run lengthwise down the axis of long bones. these columns are composed of lamellae, concentric rings of bone, surrounding a central channel, or haversian canal, that contains the nerves, blood vessels, and lymphatic system of the bone)]