As cities along the western coast of North America grew, people began building houses in the chaparral regions
Many homeowners have chosen to landscape with drought-resistant native plants in an effort of conserve water, a valuable resource in this dry biome. Nevertheless, the dry chaparral summer remains susceptible to fires. Nearly every year, fires sweep through the area, destroying homes, displacing people, and costing millions of dollars. What is the best solution to this problem?
A) Immediately extinguish all fires in this area.
B) Plant tall-growing trees to increase shade.
C) Stop building homes in fire-prone areas.
D) Plant species from damp areas to increase the moisture content in the area.
E) Evacuate people during the fire season.
C
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Would the first cells most likely have used DNA as their genetic (information storage) molecule?
A. yes B. no C. It's difficult to know.
The chemical bonds that are formed when atoms with temporary zones of positive charge are attracted
to other atoms with temporary zones of negative charge are called ____.
a. polar covalent bonds b. van der Waals forces c. ionic bonds d. hydrogen bonds e. nonpolar covalent bonds
Arsenic poisoning affects ATP production by ____
a. using excess oxygen b. interfering with Krebs cycle and electron transport chain reactions c. increasing carbon dioxide levels d. blocking glucose entry into cells
e. blocking the enzymes of glycolysisEndocrine hormones are
A) released from a nerve cell and diffuse across a synaptic gap to influence the target cells. B) electrical signals that move between adjacent cells. C) released from gap junctions directly into the cytoplasm of the connected cell. D) chemicals released by cells into the surrounding extracellular fluid and affect only other nearby cells. E) chemicals released from certain cells that travel via the blood to target cells.