farmer fran sprays her sugarcane field with a highly effective pesticide called 'bayou bug blast'. for five years the pesticide works without a hitch, effectively killing almost all of the bayou weevils trying to eat farmer fran's crop. however, during the 6th year, some of the crop takes a hit. during the 7th year, she loses half of her crop, and during the 8th year, she loses almost the entire cane field to bayou weevils, despite using twice the usual dose of bayou bug blast. what happened?
a) the sugar cane became used to the pesticide, rendering it ineffective.
b) bayou weevils over-populated, because bayou bug blast killed all of the predatory insects.
c) a small population of weevils survived on other food sources and returned to the sugar cane field to feed.
d) the weaker weevils were killed, and farmer fran accidentally caused only pesticide-resistant weevils to survive.

The weaker weevils were killed, and Farmer Fran accidentally caused only pesticide-resistant weevils to survive.

Explanation:

Over the years, pests builds resistant as a result of continuous exposure to a particular pesticides, hence; those with strong immunity were able to pass across the gene to the younger generation and with time they became used to it and makes it less or not effective on them.

answer: b: experiments that showed that all cells are similar in how they metabolize and in their composition

explanation:

step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.