Which of the following describes a relationship of commensalism?
oxpecker birds eat parasitic ticks off the backs of zebras
a tapeworm latches itself in the intestines of a rat, feeding off all the nutrients eaten by the rat
a polar bear catches a seal for dinner
birds feed off the insects that are stirred up from the grasses as cattle move through

Ahypothesis that has been tested again and again , with similar results each time may become a law , true or false

I’m doing some practice exam questions for biology, and i’m not sure how to do these 3 parts to the question.

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