How does the lysosome membrane better facilitate the function of the organelle? a) diffusion of essential ions against a concentration gradient maintain homeostasis. b) pathogens cannot enter the organelle from the cytosol by diffusion. c) the phospholipid bilayer is hydrophobic which decrease the amount of water entering the cell. d) the membrane contains the acidic environment needed for digestion that could be harmful to other functions within the cell.

Often, caries will develop in an area of the tooth that's not readily accessible. which cavity preparation form defines this? a. retention b. resistance c. outline d. convenience

1. emigration the movement of people from one place to another 2. immigration a situation in which resources are being used up at a faster rate than they can be replenished 3. migration the leaving of one's homeland to settle in a new place 4. overpopulation the movement of people to a new country 5. sustainable development a situation in which the birth rate is not sufficient to replace the existing population 6. underpopulation the ability to meet current needs without reducing the ability to meet future needs 7. unsustainable development the increase in the population of a city 8. urbanization a situation in which the number of people exceeds the available natural resources in an area

Which of the following is the source of energy for photosynthesis? a.) glucose b.) chlorophyll c.) carbon dioxide d.) sunlight