Please help- im failing this subject and this is the last retake- i dont really want my asz beat today so please answer quickly i have 20 more minutes, im timed- ill do anything i possibly can if you actually help- i dont have many points.
Which of the following correctly identifies the most productive layer of a soil profile?

topsoil, just below undecomposed organic matter

parent material, just above bedrock

undecomposed organic matter, at the very top

subsoil, between topsoil and parent material

According to the loco mass the mass of reactants and products

In the family tree below, people with the recessive trait of attached earlobes are shaded gray.

What was dr. willem johan kolff’s first step in using the scientific process to invent the hemodialysis machine? he built the machine and tried it with various patients, collecting data about its effectiveness. when a patient’s kidneys failed, he wondered if it would be possible to perform kidney functions with an external machine. he researched and collected data about numerous patients who exhibited symptoms of kidney failure. he drew conclusions from studies of various symptoms of kidney failure, and drew a design for the ideal external blood-processing machine.