In the south, an older mountain range was formed 300 million years ago, then eroded away. The rocks of that older range were reformed into the Rocky Mountains. The Rocky Mountains took shape during an intense period of plate tectonic activity that resulted in much of the rugged landscape of the western North America.
B=book
a=backpack
b=50
b=2a-20
50=2a-20
2a=75
a=37.5
it cost $37.5
Answer:
The cartilaginous fish are jawed fish with paired fins, paired nostrils, scales, two-chambered hearts, and skeletons made of cartilage rather than bone. Examples of the cartilaginous fish include sharks, rays, and skates
Explanation:
Produces insulin to regulate blood sugar levels in the body
ORIGINAL SCIENCE
Explanation:
- Science is an enterprise building term that organizes theories and knowledge in the form of tests and predictions based on the universe.
- Ancient Egypt and Mesopotamia were the roots in which science was discovered in around 3500 to 3000 B.C.
- Modern sciences are divided into three sciences and they are
SOCIAL SCIENCES( ECONOMICS, PSYCHOLOGY)
NATURAL SCIENCES (BIOLOGY, PHYSICS, CHEMISTRY)
FORMAL SCIENCES( LOGIC, MATH)
- Original science was first termed as NATURAL PHILOSOPHY and the scientists of this science were termed as NATURAL PHILOSOPHERS.
- The English word scientist was termed by WILLIAM WHEWELL in the period of the 19th century.