In early embryonic development the cells start to differentiate based on ...

a. hormones secreted by the uterus

b. amniotic fluid produced by the placenta

c. their location, or layer

d. chemicals secreted by the blastocyst

The epithelium lining the stomach, small intestine, and most of the large intestine is simple columnar; the epithelium in the oral cavity, esophagus, and pharynx is stratified squamous. Are these two statements true or false?

Where do each of these reactions take place?

How do most carcinogens cause cancer?

What region of the brain is known as the "relay center" for ALL sensory information a. Thalamus b. Hypothalamus c. Epithalamus d. Corpus collosum e. Cerebral peduncles

What calcium-rich formation builds the internal skeleton of echinoderms?

1. Synthesize Information How do you explain to the horse owner why this foal was born with OLWS while two previous foals were perfectly healthy? What would you tell the new parents of the baby girl about their prospects for having more children?

What organelle is the control center for the cell and holds the DNA

The primary structure of a protein refers to the sequence of amino acids that are linked together in a long chain. Which of the following common items would best represent the primary structure of a protein? O A.

How many chromosomes do humans have? how many copies in normal cells? How many pairs? How many copies in sex cells?

How many times has blastopore fate changed over the course of evolution? -o times -1 time -2 times - multiple times