Why are gymnosperms considered to be "naked seed" plants?
A) Their seeds have a thin layer of endosperm.
B) They do not produce seeds; they produce only spores.
C) Their seeds are not enclosed within ovaries.
D) Their seeds develop on the surface of sporophytes.
C
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You are given the task of finding all the information that you can about a newly discovered species. Unfortunately the only material you have to study is a small tissue sample. You are able to sequence the DNA of this animal from the sample, and in doing so you find that the animal has multiple clusters of Hox genes. Without looking further, what can you conclude about this species? Check all that apply.
_____ It is a vertebrate. _____ It has the potential for tremendous structural complexity. _____ It is a chordate. _____ It is endothermic. _____ It is a primate.
The removal of the ____ gland(s) will disrupt
normal blood clotting and muscle contraction. a. thymus b. thyroid c. pituitary d. parathyroid e. pancreas
Blood pressure in veins is lower than blood pressure in arteries, due in part to the larger diameter of veins
Indicate whether the statement is true or false
How can you tell the difference between the sound of a tuba and that of a flute?
A. Each part of the spiral organ is sensitive to different wave frequencies. B. Lower pitches activate all three bones of the middle ear, while higher pitches only activate one or two. C. The cochlear nerve fires more frequently for higher pitches and less frequently for lower pitches. D. The brain interprets pitches based on the strength of the sound waves. E. Lower pitches cause the tympanic membrane to vibrate, while higher pitches vibrate the vestibular canal.