Which of the following is not a level of organization in the vertebrate body?
A. Bones
B. Organ systems
C. Tissues
D. Cells
E. Organs
Answer: A
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In most flowering plants, one sperm nucleus fuses with an egg forming a zygote that develops into an embryo. Another sperm nucleus fuses with ____
a. the endosperm mother cell to produce three cells, each with one nucleus b. the endosperm mother cell, forming a diploid cell c. the endosperm mother cell, forming a triploid (3n) cell d. one of the smaller megaspores to produce what will eventually become the seed coat e. one of the smaller megaspores to produce a diploid endosperm
Y-linked traits are ____
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In cactus plants, the__________ is the main organ of photosynthesis
a. leaf b. spine c. stem d. flower e. fruit