Cacti have thick stems with lots of sharp spines. How do the spines help the cactus survive? They allow the cactus to capture more sunlight.
They help the cactus grow taller stems.
They help the cactus produce colorful flowers.
They protect the cactus from being eaten by animals.

Why does the sun appear to be the brightest star in the sky? a- its apparent brightness is much greater than other stars. b- it burns more gas, making it brighter than any other star. c- it is the largest star in the galaxy, so it is the brightest star. d- its relative distance to earth is closer than the other stars.

How many grams of ammonia are produced when 1.0 mole of nitrogen reacts

The barometer shown in fig. p1.35 contains mercury ( 5 13.59 g/cm3 ). if the local atmospheric pressure is 100 kpa and g 5 9.81 m/s2 , determine the height of the mercury column, l, in mmhg and inhg.