Please help, I have answered the first two but I can’t work out the last two. Thank you :)

b) study and study to score well dear

organisms are more likely to be more preserved in mud than sand because mud is moist and wet, while sand is very dry.

in cartography, a contour line (often just called a "contour") joins points of equal elevation (height) above a given level, such as mean sea level. a contour map is a map illustrated with contour lines, for example a topographic map, which thus shows valleys and hills, and the steepness or gentleness of slopes.

explanation: