a) Mars has several features that are similar to earth- True

Reason:- Mars seems very earth-like. There are ice-caps on its poles, drifting white clouds and dust storms in its atmosphere. It has changing season like earth. Mrs experiences summer and winter season, each of which lasts for almost six earth months. The planet's distance from the sun causes these seasonal changes to be more extreme . It even has twenty four hour day.

b) Nuclear wastes are biodegradable- False

Reason: Nuclear power plants produce nuclear waste, which is not biodegradable. It is extremely dangerous. Moreover it remains hazardous for thousands of years. There are several ways in which nuclear waste is stared, such as burning the waster under the ocean floor, storing it under ground shouting it into space.