What temperature is needed for Inuclear fusion to occur in the core of a star?

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

Apart of an ecosystem that can restrict the growth of a population is referred to as

Predict the results of a two base insertion or deletion in a strand of dna that codes for a protien, how does this differ from a three base insertion or deletion?