Which of the following shows the levels of organization in a multicell organism from the smallest level to the largest?
a: cell, tissue, organ, organ system, organism
b: organism, organ system, organ, tissue, cell
c: crossed out
d: organ system, cells, tissue, organism, organ

Invasive species are one of the major threats to biodiversity. these species multiply quickly and compete with native species for food, sunlight, spac and other resources. on the map, determine the area where native species will have limited resources available to them due to invasion threat from invasive species threat very low low medium high very high

What causes darkening of the skin as melanin production increases

What percentage of light hits earth's surface directly?