Calcium has an atomic number of 20; therefore, calcium has 20

protons

protons plus neutrons

shells

Which statement is NOT true about the universe? A) Stars have the same brightness, color, and mass. B) New stars and galaxies are discovered every year. C) Galaxies are significantly larger than solar systems.

A protein can begin to fold and to bind to other proteins while still being synthesized on the ribosome. True False

What do the amino acids tyr, asn, and thr have in common?

A grassland environment, called a savanna, would be able to support the energy needs of carnivores because A grasslands have grasses and plants to eat for animals that are not carnivores, which then provides animals for the carnivores to eat.

How could the speed and direction of motion of an object be changed? A) By increasing an object's inertia B) By decreasing an object's inertia C) By unbalanced forces acting on the object D) By balanced forces acting on the object

7. Choose the best explanation of the difference between evolution and natural selection. A. Natural selection is the idea that species change over time, and evolution is the idea that our world changes over time. B.

Physical characteristics of down syndrome

Very long molecules that conatin instructions that cells need to function ate called

What is science denial?

What is the function of the cell membrane? A) to give shape to the cell B) to increase the number of cells C) to control what enters and leaves the cell Eliminate D) to produce macromolecules within the cell