Answer:
It is possibly connective tissue
Explanation:
Population decreases by 15.
Birth rate means more population (positive), death rate means less population (negative), immigration means more (positive), and emigration means less (negative). So, just add and subtract the appropriate numbers:

Negative 15 people means that the population decreases by 15.
Photosynthesis will result in gain of energy in an ecosystem
Actually ignore that persons answer its open ocean. im only telling you because its in my text book for penn foster hopefully you didnt get it wrong!
Answer:
Harmful algae blooms is a result of nutrient pollution particularly nitrogen and phosphorus.