A certain atom of helium has 2 protons and 3 neutrons in its nucleus. It has 2 electrons in its electron cloud. What is the atomic mass of this atom?

nd which of the following small bodies are hardest to tell apart because they have similar bodies? A) Dwarf planets and comets ... C) Asteroids and comets ... D) Asteroids and meteoroids.

A small group of rodents have arrived on an island in the Pacific Ocean where no rodents are naturally found. This small group may rapidly evolve into several different sub-species to take advantage of different means of survival.

How does population density differ from population size? a Population size lakes all organisms into account, while population density only takes specific age groups of the population into account b.

Which of the following statements is true? A. Instantaneous acceleration is always changing. B. An object that is accelerating is always changing direction. C. An object at rest has an instantaneous acceleration of zero. D.

Our day is 24 hour long because that is the time it take to

How can the lymph system reduce the spread of cancer? A. By producing lymphocytes, which attack and kill cancer cells B. By producing lymphocytes, which create antibodies against cancer cells C.

During warmer months, manatees have been sighted from: a) North Carolina to Texas b) Massachusetts to Texas c) None if the answers provided d) Georgia to Alabama

The parts of the brain that decrease in volume as senescence begins are called:

How are tropical rainforests and temperate forests different

From microchip implants to wristband trackers and sensors that can detect fatigue and depression, new technology is enabling employers to watch staff in more and more intrusive ways. How worried should we be?