Why does the international date line does not follow a straight line

Danielle has blonde hair. her mother has blonde hair and her father has brown hair. which explains how danielle inherited her hair color? she inherited a chromosome that carry alleles for hair color from someone other than her mother and father. she inherited a chromosome that carries an allele for hair color from only her father. she inherited a chromosome that carries an allele for hair color from only her mother. she inherited a chromosome that carries an allele for hair color from each parent.

If scientists only detect p waves in a certain layer of earths interior what does that tell us?

Explain how earths tilt and revolution around the sun affects weather and climate