The human cardiovascular system is comparable in some ways to a car's:
A) electrical system. B) cooling system.
C) engine. D) transmission system.
Answer: B
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In 2013, scientists in Europe discovered a new organelle in grapes that they named the tannosome. This discovery was the result of creative microscopy. If looking to discover a new organelle, which are located inside the cell, what kind of microscope must be used?
a. brightfield microscope b. scanning electron microscope c. transmission electron microscope d. compound light microscope.
The layers of cells that protect the root apical meristem are the
A. endodermis. B. bark. C. periderm. D. root cap. E. cortex.
Using the figure, the country of ________ may possibly lose migrating ungulate populations if global climate change shifted precipitation patterns
Fill in the blank(s) with correct word
Which molecule is a first messenger but not a second messenger?
a. G protein b. cyclic AMP c. acetylcholine d. protein kinase e. adenylyl cyclase