If a ramp to the top of a 30 meter building at a construction site has a mechanical advantage of 4, how long must the ramp be?

What is the answer for the complicated molecules that make up living things usually contain carbon. why is carbon so important in these molecules?

Ascientist discovers a new body between the orbit of neptune and the kuiper belt. the object is round and travels in an orbit around neptune with other space objects. the scientist claims that she has found a new dwarf planet. where is the scientist’s error?

Most animal cells membranes have proteins that pump ions out of the cell and potassium ions into the cell