Name the valve (sphincter) that controls food movement from the stomach into the duodenum.

Also called a longitudinal wave, they are waves shoes direction of vibration is the same as their direction of travel. They produce compression and rare fraction when traveling through a medium

A certain atom has an atomic number of four. How many protons does it have?

Which statements describe disadvantages of using natural gas as an energy source? Check all that apply. It is expensive to use. It is hard to stop using. It is a nonrenewable resource. It is damaging to the environment.

An is a mass of a living protoplasm

Homologous structures might be the result of a change in allele frequencies over successive generations. why have these structures probably continued? they were predestined in a species. they were beneficial in a particular environment.

Plants use sunlight to produce some ATP during photosynthesis. How do plants produce ATP when the Sun is not out? a. Plants are secondary consumers. b. Plants also use cellular respiration. c. Plants extract ATP from the stars. d.

Describe 4 ways that we know the global climate is changing

What does each individual node in a cladogram represent

PGA is the first stable product of

What does PMAT stand for