Can anybody help me with this question

Aseries of connections of food chain in an ecosystem is called a what

Genetic disorders can result when sister chromatids fail to seperate properly. during what phase is this problem most likely to occur?

If the dimensions of a cube-shaped cell with a length, height, and width of 1 micrometer were to double, what would be the cell's new ratio of surface area to volume? a.3 to 1 b.4 to 3 c.1 to 2 d1 to 6