When a human embryo develops, it produces a special type of hemoglobin not found in infant, child, or adult blood. Which statement best explains how an embryo can produce a different type of hemoglobin from that of an infant, a child, or an adult?

A.) Humans have genes for different types of hemoglobin, and they are expressed at different times.

B.) Human genes change slowly as a person ages.

C.) An embryo and an adult have different genes for hemoglobin.

D.) As the embryo develops and cells differentiate, certain genes are lost.

If water were a non polar molecule, how would its properties be different ? a.) water would be a much lighter molecule b.) water would be able to climb up inside plants c.)water would not be able to form hydrogen bonds d.) water would stick together much more strongly

Acceleration is a direct result of a.) balanced forces b.) unbalanced forces c.) gravity d.) velocity

Choose one animal (cheetas) and research on the internet what has contributed to this animal becoming "endangered" or "threatened." what animal you have chosen? how long has the animal been endangered or threatened? what has contributed to this animal’s endangered or threatened status? why is it important to save this animal from extinction? after researching and gathering facts, write a 350-word letter from the point of view of an animal rights' activist. be sure to include at least five facts that you learned from your research.