A(n) __________ is an organ that allows exchange of nutrients between an embryo and its mother.
Fill in the blank(s) with the appropriate word(s).
placenta
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Because they are morphologically simple, Psilotophyta (whisk ferns) have traditionally been thought to be a basal group in the radiation of land plants
Molecular phylogenies have challenged this hypothesis and support the alternative hypothesis that they_____. A) are the sister group to the seed plants B) represent a grade rather than a monophyletic group C) have lost complex structures in this lineage D) represent a lineage that forms a monophyletic group with Lycophyta
Discuss the evolution of the coelom and pseudocoelom. What advantages do coelomate animals have
over acoelomates? What will be an ideal response?
Which of the following statements concerning malignant melanoma is false?
a. It is the fastest growing (in number of incidents) form of skin cancer. b. It is the most lethal form of skin cancer. c. It is the third most common form of cancer in humans. d. Its highest incidence is in light-skinned individuals. e. It is caused by excessive exposure to UV irradiation.
Second part of the small intestine___________________
Fill in the blank(s) with the appropriate word(s).