Which of the following is a biotic factor? Α. Starfish
B. Salt
C. Sea water
D. Sand

The entire regulatory control of the cell cycle is mediated by cyclin dependent protein kinases. its activity is modulated by the presense of different types of cyclins, which change based on the different phases of the cell cycle (eg there are g1, s, and m cyclins).

Event 1. a cataclysmic event initiated the collapse of the solar nebula.step 2. the temperature of the solar nebula began to increase, as it rotated faster and flattened into a disc.step 3. hydrogen and helium remained gaseous, but other materials would condense into solid "seeds."step 4. temperature differences in the nebula caused terrestrial planets to form closer to the center of the nebula and gaseous planets to form farther out.step 5. solar wind from the sun blew the remaining gas into interstellar space.

Answer: a the best recommendation that could be made to reduce introduction of non-native species to new environment is that methods should be put in place to reduce the ability of species from escaping from captivity and establishing themselves in new locations to prevent serious problems with marine ecosystems.