Multiple choice Lake Baikal, in Russia, has more species of worms than other similarly deep and cold lakes because

a. Migratory birds introduced worms to this lake.

b. A large mammal died at its edge and worms found a plentiful food source.

c. This lake did not experience a glaciation period.

d. Worm species migrated from nearby lakes.

e. Worm species were introduced to the lake by local human populations.

the correct answer: the index of refraction of the second medium is lower i tried this persons answer and it was wrong this person is lying

blah

explanation:

bc blah

in 1859, charles darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. he defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".

condenser is used to focus in the light microscope.