Which of the following systems has a similar organizational structure to the simplified (or Bohr) model of the atom, including the nucleus and electrons ?
A.
a cereal box with a toy inside
B. a computer with a powerful CPU
C.
a football game where an offense and a defense fight over the ball
D.
the solar system
E.
an airport with planes landing and taking off

Amylase is an enzyme found in the human digestive system. why do you think it was important to keep the enzyme temperature about 37 degrees celsius (98.6 degrees f)? describe what might happened the temperature decreased by 10 degrees celsius.

For a to be healthy, it has to have lots of different kinds of plants and animals. all of the different types of plants and animals in an ecosystem. name four types of ecosystems from those listed in the video. b) c) d) most living things live here. all living things depend on how an ecosystem like a game of sticks? why should we build new buildings on existing land? name four extinct species from those listed in the video. b) c) d) the best way to wipe out a species is to the largest ecosystem in the world is this percent of the world is covered by water. how many of all species in the world live in the ocean? list five things you can do to increase biodiversity. b) c) d) e) how many species are we losing per hour?

If you have a difficult time knowing where your hand is without looking at it you may be having a problem with your what ?