What is a substance?

A.

a uniform mixture that can’t be separated

B.

a mixture that can be separated

C.

a single component that can’t be separated

D.

a single component that can be separated

Which of the following observation darwin shape his concept of descent with modification? a) species diversity declines farther from the equator. b) fewer species live on islands than on the nearest continents. c) birds live on islands located farther from the mainland than the bird's maximum nonstop flight distance. d) south american temperate plants are more similar to the tropical plants of south america than to the temperate plants of europe. e) earthquakes reshape life by causing mass extinctions.

Kinases add - groups to other enzymes. this activities some enzyme while inhibiting other

Climate like that in the sahara desert have the fastest rates of weathering