What do biologists believe is to blame for the decrease in the amount of fish in the Columbia River? Question 3 options:

Pollution, a breach, and spawning

Fish hatcheries, fish ladders, and fishing

Fish hatcheries, pollution, and dams

Dams, a breach, and pollution

Columbia River basin salmon are among the world's most intensively ... For example, predatory fish and birds are responsible for a substantial amount of

$53.50

step-by-step explanation:

you have to subtract the amount of money chuck earned ($72.50) by the cost of the gas for the mower ($11.25) and the new string for the trimmer he bought ($7.75).

72.50-11.25=61.25

and then subtract $61.25 by the second thing he bought (the new string for the trimmer)

61.25-7.75=53.5

so in total it's $53.50 (53 dollars and 50 cents)

24/56=hx^7

step-by-step explanation: