Why is the earth’s core made up mainly of iron while the crust contains mostly silicate minerals? a. because iron melts and silicate minerals do not b. because iron is less dense than silicate minerals c. because silicate minerals melt and iron does not d. because iron is denser than silicate minerals

The image shows embryos of three vertebrate classes

The diagram illustrates the activity of vesicles during a cellular process.

Put the following processes of protein synthesis in the correct order: - dna strands unwind and separate - mrna copies dna according to complimentary base pairing - trna's anticodons bring amino acids to the corresponding mrna codons - amino acids bind to each other making a protein - mrna leaves the nucleus - a stop codon is reached, the newly formed protein is released to go do its job for the cell