About how many new species did the HMS Challenger find during its journey around the world?

Suggest why placing wheels under a heavy box reduces the neccessary force required to push it along at a constant speed.

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

19. a cell is viewed under a microscope and is found to have two nuclear envelopes and spindles that appear to be breaking apart. which phase of mitosis is the cell most likely in? a. metaphase b. prophase c. telophase d. anaphase