Calcification zone
What will be an ideal response?
Surrounding cartilage matrix calcifies; chondrocytes die and deteriorate.
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Which of the following plant organelle is a colorless plastid that stores starch in roots?
A. thyloplasts B. chloroplasts C. chromoplasts D. amyloplasts E. both chloroplasts and chromoplasts
The presence of genes that encode many types of hemoglobin in mammals, but not in other vertebrates that evolved
earlier, is evidence of ____ of genetic material.
a. an inversion b. the duplication c. reciprocal translocation d. the deletion e. both duplication and deletion
Which cardiovascular structures in the fetus shunt blood away from the fetal lungs?
A) foramen ovale and ductus arteriosus B) foramen magnum and ductus venosus C) foramen ovale and ductus venosus D) umbilical artery and umbilical vein E) umbilical artery and ductus venosus
During the course of evolution, one of the main threats to human survival was ____________. Persons who stood the best chance of survival were those __________.
(a) extreme cold; who were heavier and had a protective layer of body fat (b) the presence of vegetation that was toxic if eaten; who ate only meat (c) inconsistent food supplies; who preferred high-calorie foods (d) animal predators; who were lean and could ambulate quickly