To survive successfully on land, plants needed to develop
A) the ability to use oxygen.
B) methods to prevent water loss.
C) internal skeletons.
D) photosynthesis.
E) swimming sperm.
B
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Which type of microscopy would be preferred for showing fine internal detail of the eukaryotic organelles?
A. Bright-field microscopy B. Transmission electron microscopy C. Scanning electron microscopy D. Fluorescence microscopy
In a marine environment, which of the following is NOT a limiting factor for primary productivity?
a. depth of the water b. nutrients c. sunlight d. water e. nitrogen
The area in the figure marked "A" is likely to
become a. vacuoles. b. Golgi bodies. c. mitochondria. d. chloroplasts in some cells. e. endoplasmic reticulum
The levels of cerain ions in the blood are regulated by the kidneys and help determine?
a. Emptying of the bladder b. Blood sugar levels c. Body temperature d. blood pressure