When does the cell have to use active transport?
a. when the cell is low on energy
b. when the cell is in a highly concentrated solution
c. to move molecules across the membrane quickly
d. to move molecules across the membrane against a gradient

Barbara is converting 78°f to degrees celsius. first, she subtracts 32 from 78. what is the next step?

Sea levels are rising due to climate change while increasing numbers of people are moving into coastal areas. to accommodate more people, there has been increased construction of beachfront resorts and condominiums. how is this impacting sea turtle numbers and biodiversity and why? a. the increased human population in coastal areas has meant that more food is available to the turtles (e.g., dropped food, waste from restaurants), which has led to an increase in the numbers and diversity of sea turtles. b. there has been very little change in the numbers and biodiversity of sea turtles because the planet is so vast that they can simply relocate to less crowded beaches. c. this has resulted in a decrease in numbers and diversity of sea turtles because it is restricting available nesting sites, and hence reproduction. d. this has resulted in an increase in numbers and diversity of sea turtles because people are around to protect them from natural predators.

How does natural selection change thephenotypes within a population over time?