Cells grown in laboratory culture dishes undergo only a fixed number of division before dying. The number of possible divisions drops depending on the age of the donor organism. This phenomenon is called the

which of the following statements is false? A. disturbance in an ecosystem is an event that changes the availability of resources in that ecosystem. B. disturbance are by definition harmful and undesirable for ecosystem. C.

What two burnt-out stars does PSR B1629-26 b orbit? A light year and a red dwarf A pulsar and white dwarf A black dwarf and a burst A brown dwarf and the sun

Pigment can be found in several layers of the epidermis. In which layer would you expect to find the cells that produce melanin? Pigment can be found in several layers of the epidermis.

if another praire dogs migrates into an area, whats most likely to happen the praire dogs populution

A third species of kangaroo rat is introduced into the habitats of the two species from question 5. if this third species is biologically similar to the first two, but also eats insects, which of the following will most likely happen?

What's an example of a multicellular producer

Are microorganisms alive and do microorganisms affect humans

Which statement best describes the process of chemiosmosis and the direct result of its occurrence? A. The choices are Hydrogen ions flow from the thylakoid down a concentration gradient through ATP synthase channels into the stroma.

Describe how human activities threaten polar bears in the arctic

What did Mendel cross pollination of pea plants prove