Hello, which off the following facts are known/unknown by scientists?

Question

Thanks sooo much! Remember, I don't need you to answer these, I just need you to tell me if they are known to scientists! xXx


A) is there life on the universe anywhere other than earth?

B) Did any people live during the time of the dinosaurs?

C) How long did it take for multi celled organisms to develop from the earliest single-celled organisms?

D) What is the sun made from?

E) Where and how does the earth move though space?

I think there is meant to be 3 known and 3 unkown

Answer 1

A) Unknown

B) Known

C) Known - give or take a million years or so

D) Known

E) Known

Answer 2

A) Nobody knows for sure, but most scientists consider life beyond earth a certainty and intelligent life likely.

B) No, dinosaurs existed 65 million years ago, humans earliest ancestors only appeared about 4 million years ago and modern humans have only been around for a few hundred thousand years.

C) The first multi-cellular organisms appeared about 1.2 billion years ago, life has existed since about 3.7 billion years ago.

D) The sun is made up (primarily) of Hydrogen and Helium.

E) The simplified answer is that the earth moves through space in orbit around the sun because of gravity. The sun moves through space in orbit around the center of the galaxy.

Answer 3

Well, "knowledge" is a philosophical subject, and many scientists would say "the evidence overwhelmingly suggests" rather than saying, "I know." But leaving that fine point behind:

A) unknown
B) known
C) known to within certain limits
D) known
E) known

Answer 4

a unknown
b known
c unknown
d known
e known