A longer growing season is a result of . a. an earlier start to spring b. earlier animal migration c. species having a narrow temperature range tolerance d. invasive species

The correct answer is - a. an earlier start to spring

Explanation:

A longer growing or flowering season of a plant is a result of an earlier start to spring as it will start earlier than usual due to the warmer conditions in the environment.

Due to this longer growing and flowering season, the growth of the plant will also be increased as result. If the temperature is high and conditions are warmer that might start early spring.

Thus, the correct answer is - a. an earlier start to spring

answer: tributaries flow into rivers.

wetland is a biome that develops when the water gets accumulated in a land exhibiting a huge depression. these form either seasonally or permanently. the water in the wetland comes from rivers, lakes, ocean, flood, rain or other sources. the wetlands includes mangroves, marshes and peatland.

tributaries flow into the rivers develops a wetland because such water will get deposited in the depression and will restrict the original flow of tributary water. hence, water with low drainage current combines with the river water.