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It was worth 3.

hahah you have to write about both...genetics and environment. Both play key factors. Crossing over results in a different combination of alleles to parents thus "unexpected" phenotypes to parents... It def isnt wrong, but yer I get your point, you can write other stuff an still easily get the...

Yer she is a complete retard. It was A. Oxygen does not bind "strongly" to haemoglobin. She is wrong. She should not be a science teacher.

You basically also had to talk about how variation can lead to a recombination of genes aka a different combination of alleles = different genotype = different phenotype, thus "unexpected results". I spoke about: Mutations, Sexual reproduction - basically the genetic info from two different...

Homeostasis is wrong. Hypothalamus is wrong. According to my bio teacher who is a marker....The nerve system is wrong. Thermoregulatory aka Thermo-regulatory system is the correct answer.

THE ANSWER IS: THE THERMOREGULATORY SYSTEM. I asked my teacher. That's what I put.