Answer:
The options are
A) they may affect several populations in an ecosystem
B) they cannot be caused by human activity
C) they affect food chains but not food webs
D) They have no effect on living organisms in an ecosystem him
The answer is A) they may affect several populations in an ecosystem
Explanation:
Environmental changes include deforestation and climate changes. Organisms depend on their habitat and climatic conditions for their survival because it determines their food availability too.
When environmental change occurs they may affect several populations in an ecosystem.
Answer:
Immortal cell line
Explanation:
An immortalised cell line is a population of cells from a multicellular organism which would normally not proliferate indefinitely but, due to mutation, have evaded normal cellular operation and instead can keep undergoing division. The cells can therefore be grown for prolonged periods in vitro
Immortal cell lines are a very important tool for research into the biochemistry and cell biology of multicellular organisms. Immortalised cell lines have also found uses in biotechnology.
Tobias drank from a contaminated water fountain
B. Using fewer fossil fuels, such as gasoline for a car, reduces the emission of harmful pollutants into the air
Answer: It's known as the continental drift :)
Explanation: "Pangea's existence was first proposed in 1912 by German meteorologist Alfred Wegener as a part of his theory of continental drift. Its name is derived from the Greek pangaia, meaning “all the Earth.”" (copied from google)
