Which of the following is/are correct about light?
o a. light always travels at the same speed. b. light energy travels as waves.
c. light cannot travel through liquids.
d. all of these

Which of the following is an example of competition a. the leaves of a tree prevent a small shrub from getting sunlight. three species of birds feed a different heights in the same tree. b. three species of birds feed at different heights in the same tree c. zebra and giraffe’s feed on different grassland plants d. cats living in two different homes eat the same brand of cat food.