What are the three layers that form from the blastocyst and what does each layer become?
What will be an ideal response?
Ans: As the cells continue to proliferate, the solid ball becomes a hollow ball called a blastocyst, which has a group of cells at one end called the inner cell mass and an outer ring of cells called the trophoblast (see Figure 4.2). The inner cell mass will go on to become the embryo and part of the amnion that surrounds the embryo, and the outer ring will become the support system for the pregnancy, which includes the placenta and the chorion.
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Director credentialing is currently available in ____.?
a. ?all states b. ?only states that require accreditation c. ?almost every community d. ?a growing number of states
A strong vocabulary program requires all of the follow except
a. regular vocabulary assessments b. engaging discussions with a text read aloud c. teaching students to use word learning strategies. d. Extensive independent reading
Phonemic awareness can be defined as the recognition that spoken words consist of a sequence of sounds
Indicate whether the statement is true or false
What is most often used in the classroom to decrease behaviors that are being maintained by
teacher attention? a. Positive reinforcement b. Differential reinforcement of alternative behaviors c. Noncontingent reinforcement d. Extinction