Identify an environmental condition in the ecosystem above and how it can affect the ecosystem

Iknow the answer to 13 is b and 14 is d. i just need to know why the correct answers are correct

The chart shows the bid provided by four contractors to complete a job. which contractor is the most cost-effective?

6. using 3 – 4 sentences explain (in your own words) why water expands when it freezes? 7. using your knowledge of colligative properties explain whether sodium chloride or calcium chloride would be a more effective substance to melt the ice on a slick sidewalk. use 3 – 4 sentences in your explanation.