The number of trophies levels in an ecosystem pyramid

A) is limitless

B) is limited by the amount of energy that is lost at each trophies level

C) is impossible to count because energy is lost at each trophies level

D) never exceeds three

How do structures in living organisms compare with structures of non living things such as construction cranes, buildings, ships, airplanes, or bridges?

How many copies of a dominant allele are needed for that trait to show up?

A 4-year-old boy with a tracheostomy tube is experiencing respiratory distress. He has intercostal retractions, a heart rate of 80 beats/min, and an oxygen saturation of 85%.

The process of heat transfer thought to be responsible for the movement of the lithospheric plates on the surface of the earth is

The three main functions of a mammal's hair are: _, _, and _.

Grandpa Sam used to tell his grandkids how he first laid eyes on Grandma Sylvia. "When I was courting your granny, I was dazzled by her beautiful, LONG eyelashes. What a looker she was." "Yes, and a handsome man he was too," said Grandma Sylvia.

Jim is categorized as poor. Thus Jim's daily income must be less than how much dollars? Jim must be earning less than dollars per day.

Why does blood pressure decrease as the blood travels from arteriesto arterioles to capillaries?

Kangaroos that nurse their young in a pouch are what type of mammal? monotreme marsupial placental mammal

Sharon is a 32-year-old horse trainer. while training a young horse, she was thrown off of the horse and suffered a mild head injury. the nurse inquires about the use of a helmet.