The theory of evolution is

1. a scientific theory, meaning that it is backed by extensive evidence.
2. one of several competing scientific models that all seem equally successful in explaining the nature of life on earth.
3. essentially just a guess about how life changes through time.

What is the type of the reaction below? bacl2 + h2so4 → 2 hci + baso4 double replacement synthesis single replacement decomposition

Suppose a comet has an orbital period of 309.1 years around the sun. what is it’s average distance from the sun?

Two students, each riding bicycles, start from the same apartment building and ride to the same building on campus, but each takes a different route. the first student rides 1100 m due east and then turns due north and travels another 1430 m before arriving at the destination. the second student heads due north for 1930 m and then turns and heads directly toward the destination.at the turning point, how far is the second student from the destination?