The table below shows the distances from earth to several different objects in the universe.  distances are shown in light years (ly).

objectdistance from earth (ly)alpha centauri a (star)4.4andromeda (galaxy)2.5 millionbetelgeuse (star)640

it would take about 77  million  years for the fastest human-made spacecraft to reach alpha centauri a. about how long would it take such a spacecraft to reach the andromeda galaxy?

  a. 

many trillions of years

  b. 

2.5 million years

  c. 

64.0 million years

  d. 

a few thousand years

How does land development destroy ecosystems? it increases human carrying capacity too rapidly. it converts them into residential or agricultural areas. it forces humans to import non-native plants and animals. it expands the natural range of native wildlife species.

List two new traits (structural or behavioral) that each new species of rat might demonstrate as it adapts to the conditions on two of the four islands. choose only two islands that are described in the lesson. record the island latter and the major habitat feature of the island. then list two new traits each rat subspecies might demonstrate in order to survive the habitat on that island. note: new traits should be unique to that island and be in response to that island’s habitat feature. i cannot remember islands that were names in the lesson so only answer if you have done the lesson (5.13 life science 7b) choose 2 of the islands and describe a structural and a behavioral trait for a rat on each island so 4 total answers, 2 different structurals and 2 different behaviorals, one for each rat for each island

Hurry which of these is true about index fossils? a) are very scarcely found b) used as guides in relative dating c) found in the youngest layer of the rock d) used as reference points in absolute dating