Here is your answer:
Your answer is D Melted snow.
Reason:That's because when snow melts it creates water and when it melts in a ditch it creates a stream of water! Also its not Rivers because there are combined with streams its not altitude because that has something to do with the air and when it came down to rather C, or D I choose D because C increasing rainfall there has to be a certain amount of rainfall to create streams of water maybe huge storms.
Your answer is D.
Look at this picture:
Answer;
-They cause diseases that are diagnosed by finding microscopic eggs in clinical specimens.
Explanation;
-Parasitic worms are organisms that live in and feed off a living host. There are a variety of parasitic worms that can take up residence in humans. Common types of intestinal worms include: flatworms, which include tapeworms and flukes. roundworms, which cause ascariasis, pinworm, and hookworm infections.
Microbiologists study parasitology which is the study of the relationship between parasites and their hosts. Parasites causes important diseases of human, animals and even plants. The study makes important step-forward in mission to tackle parasitic worm infections.
For the first blank it would be a decline in the lynx's population, because when there is a rise in a population it means there are going to be more of that species, stagnancy is when there is a stagnant smelling pond, bad smelling. for the second blank direct competition for the survival/food, because thats an animals nature, to survive at all costs, while Intraspecific means produced/producing, occurring, or existing within a species or between individuals of a single species of animal, while Apparent means clearly visable/obvious.