Communication from a cell’s ‘environment’ to the cell will usually involve (A) a chemical messenger or an impulse and a marker protein on the cell’s surface (B) an impulse and a receptor (protein) on the nuclear membrane (C) a chemical messenger or impulse and a receptor (protein) on the cell membrane (D) a chemical messenger or impulse and a carrier molecule in the cell membrane e

State officials are considering constructing a road through a forested wilderness area. this action will likely affect the forest ecosystem in various ways. part a: predict how the construction of a road could negatively affect plants and animals in that ecosystem. (3 points) part b: describe one way that the construction of a road could have a positive impact of the forest ecosystem. (1 point)

How is anaerobic respiration affected by changes in temperature? (5 points)based on the conditions of early earth, what conclusion can you draw about the amount of anaerobic respiration that was occurring at earth’s beginning? explain your answer.(5 points)if there was a sudden drop in temperature after the evolution of the first living cells, predict how that might have affected the changes in the atmosphere and the evolution of cyanobacteria and other autotrophs. explain your answer. (5 points)

Which pair of chromosomes determines sex in humans? a.15th b.1st c.23rd