TRAVELING BY CAR IS ………..A. CHEAP B. VERY EXPENSIVE C. NOT APPRECI...

40. Traveling by car is ………..A. cheap B. very expensive C. not appreciated D. not suitable for familiesRead the following passage and mark to indicate the correct answer to each of the questions Over a period of time, many habitats change with respect to the types of plants and animals that live there. This changeis known as successionSuccession occurs because plants and animals cause a change in the environment in which they live. The first weedsand grasses that appear on a bare field, for example, change the environment by shielding the soil from the direct sunlight. Asthese plants spread, the ground surface becomes cooler and moisture, than it was originally. Thus, the environment at theground surface has been changed. The new surface conditions favor the sprouting of shrubs. As shrubs grow, they kill thegrasses by preventing light from reaching them and also build up the soil in the area, in addition, they attract animals that alsoenhance the shrubs. They are not able to shade out oak and hickory seedlings, however, they have found the forest floorsuitable. These seedlings grow in to large trees that eventually shade out the pines.