A biologist has determined that 16 distinct species of spiders on the Hawaiian Islands all descended from a common ancestor. The biologist also noted that there was a wide variety of different habitats on the various islands ranging from snow covered mountains to vocanic lava fields to tropical forests. Which of the following characteristics of this island chain increases the incidence of species change in the island habitat? a. current and past volcanic activity
b. isolation from the mainland
c. rapid expansion of human populations
d. a wide variety of environmental conditions

Seen in some gram-positive bacilli, occurs when only the inner portion of a cell wall is deposited across the dividing cell. this new cross wall puts tension on the outer layer of the old cell wall. eventually, the outer wall breaks at its weakest point with a snapping movement that tears it most of the way around. the daughter cells can then remain hanging together almost side by side being held by a small remnant of the original outer wall. choose from the following statements the ones that correctly discuss reproduction using binary fission in a bacterial cell. select all that apply. view available hint(s) select all that apply. due to the stretching of the cytoplasmic membrane, both cells will contain a complete genome. each daughter cell will contain an equal number of organelles. the daughter cell will be a permanently smaller copy of the mother cell but will contain a complete genome. each daughter cell is an exact copy of the other, both genetically and morphologically

What is turgor pressure, what causes it, and what does it do for a plant?

18. over time, how do sand dunes tend to migrate? a. perpendicular to the movement of the wind b. in the same direction as the wind blows c. toward the wind d. in random directions