Please help need done ASAP “Which type of large-scale environmental impacts are the most detrimental? Is all human impact on the environment negative? How can we prevent the occurrence of large-scale, negative environmental impacts?”

You are working in the lab and are working with the same element but with varying isotopes of the element. you are working with c-11, c-13, c-14, and c-15. what is the average atomic mass of this element? (use periodic table) a- 12 b-15 c-14 d-13

What's wrong with this ecological pyramid? (multiple choice)1. secondary consumers should be at the bottom of the pyramid2. the sun has an arrow leading to decomposers 3. primary consumers should come after the sun4. energy retained should increase from the bottom to the top5. the sun should be at the bottom of the pyramid

Which is the best example of plant tissue? the answer is d (just took the test)