What happens when normal human primary fibroblast cells are placed in tissue culture?

a.
they go through a fixed number of population doublings, and then they enter crisis.

b.
they go through a fixed number of population doublings, and then they enter senescence.

c.
they will divide indefinitely unless they lose their telomerase activity.

d.
they will divide indefinitely because primary cells are already immortal.

e.
they will divide indefinitely because of their telomerase activity.

Describe how an electric generator works

The first three phases of the cell cycle are collectively known as (1 point) play audio cellular respiration. telophase. mitosis. interphase.

African penguins, which inhabit the coasts of southern africa, were classified as an endangered species in 2010. two significant threats to their survival are ecosystem damage from oil spills and overfishing by humans. overfishing depletes the food supply of african penguins. the best method to reduce the threat of overfishing would be to . the risk of oil spills could be reduced by increasing the use of , which should oil consumption. if an oil spill does occur, could be used to remove the oil so the ecosystem may more quickly recover.