Your Mama told me about some really great questions you asked. She wondered how to answer you. I am far away but I would like to give you my answers to your questions.
Where do dinosaurs come from?
Jesus said, "My ways are not your ways, and my thoughts are not your thoughts," so maybe we can't figure out exactly when they those dinosaurs lived on the earth. But we can become good observers of our world. An observer is someone who looks very carefully at everything. Scientists are carefully observing the ground and they dig really deep to find bones and other signs of how old the earth is. Heavenly Father wants us to look at our earth and see all the things he made for us. He makes amazing things for us to see. Like the way a butterfly comes out of a cocoon.
Where do cocoons come from?
You are a good observer, I know, because when I was visiting with you we saw many interesting things , like the lichen growing on the wooden bench. Each day, on our walk, you came back to your job of ridding the bench of the lichen.
Three views of how old the earth is:
1)The earth was made in 6 days through catastrophic events which God has divine power to perform.
2)Each day of creation was really 1000 years so the earth is 6,000 years years old from Adam and
Eve being placed here.
3)The creation of the earth extended over immensely long periods of time.
a)The Lord works in his own time and in his own way
b)The true translation of the word day is an undefined period of time
c)Scripture uses the word "time" to distinguish periods; "this was the first, or the beginning of
that which they called Day and Night. Abraham 4-5
d)Genesis opens with 'In the beginning" and it is not agreed upon what the beginning was. Alma
40:8, "All is as one day with God, and time only is measured by man."
e)Nature shows us how slow it moves. All human experience points to the need of periods of time
for beyond 6,000 years, to fashion the earth as it appears today.
Clearly it does not matter to one's daily welfare or ultimate salvation which view you adopt, except that every Latter-Day Saint must seek and cherish truth above all else.
From Evidences and Reconciliations by John A. Widtsoe