PLEAASE PLEASE HELP ME!!! I'm failing science and he gave us this test to do. PLEASE HELP. I'll give lots of points You are tasked with investigating the sudden die-off of salmon in a river in Washington State. The salmon were trying to swim upstream to spawn but died near or just past a dam about halfway along the river's path.

You observe that numerous area farms apply atrazine to their crops at this time of year and that the one dam does employ methods for allowing salmon to move upstream past it.

The water quality data you collected include:

- high levels of sediment at one location near the middle of the river's path by the dam

- low levels of the toxin atrazine at some of the upstream testing locations along the river

- very low levels of dissolved oxygen along the entire downstream half of the river due to recent algae buildup

Which type of water pollution seems MOST LIKELY to have contributed to the sudden death of the salmon and why? Include a description of your chosen type of water pollution.

Creation of an unnaturally uniform sample to represent a diverse populationcan be avoided by: a. including only willing b. asking another scientist for .c. choosing only identical participants.d. selecting individuals at random.

The tasmanian devil, a marsupial carnivore, is facing extinction due to devil facial tumor disease (dftd) which causes bulging cancerous lumps and lesions to erupt around the face and neck — often causing enough deformation to make seeing or eating difficult. dftd has evolved into a contagious cancer, a trait that is unique among cancers. devil mating behavior involves biting around the head and neck, allowing cells from one individual — especially cells from the crumbly dftd tumors — to be transferred to the wounds or face of a new individual. this marsupial was once found across australia, but sea levels rose, isolating the tasmanian population, while the australian population went extinct. what would be an outcome of genetic isolation that is likely to have impacted the spread of dftd? a) reduced territory puts diseased individuals in greater contact with non-diseased ones. b) inbreeding results in less variation in facial features so the cancer is generally fatal. c) genetic isolation has made it difficult for scientists to develop a vaccine against dftd. d) the lack of genetic variation in the immune system of tasmanian devils minimizes resistance to the disease.

Acar company is testing seatbelts using crash test dummies. the company finds that when cars come to a sudden stop, the crash test dummies' bodies continue to move forward. the seat belt keeps the crash test dummies from hitting the back of the seat in front of them. why do the crash test dummies' bodies continue to move forward even though the car stopped? a. the friction opposing their bodies' movement keeps them in motion. b. the inertia of their bodies keeps them in motion. c. the forward acceleration of the car keeps them in motion. d. the gravity pulling on the car keeps them in motion.