Behavior refers to coordinated responses that an
animal makes to a __________. Fill in the blank(s) with the appropriate word(s).
Answer: stimulus
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Pollen germination refers to the process of:
A. pollen attachment to the stigma B. pollen dispersal C. sperm development D. double fertilization E. development of the pollen tube
The embryo is now called the fetus.
Choose the letter of the best match: A. third trimester of pregnancy B. second month of pregnancy C. first month of pregnancy D. second trimester of pregnancy E. third month of pregnancy
Chromosomes contain both ________ and ________, and early-20th-century scientists were unsure which of these molecules carried the heritable units called genes
Fill in the blank(s) with correct word
The spinal cord differentiates in such a way that...
A. the dorsal fissure separates the sensory horns from the motor horns B. the intermediate horns exist only at the cervical and lumbar levels. C. the mantle layer is motor while the basal plate is sensory. D. the sulcus limitans lines the central canal. E. the ventral fissure separates the motor horns from eachother