Horse, it’s the only thing in the list with a spine
Because if we're simultaneously moving/manipulating two different variables it can be very hard to determine why one variable is changing and why the other is changing. While this can be done with more complicated experimental designs, it usually is the case that scientists will only manipulate one variable and not two different ones.
Biology or Geology. These answers make the most sense to me.
Because they are not in charge of deciding the child's gender, males shouldn't accuse women of failing to deliver a male child for them. Everything is dependent on chromosomal fusion.
What is chromosol fusion?
Every now and then, chromosomes fuse. This fusion occurs as sperm and eggs develop, as pairs of chromosomes fold over each other and swap chunks of DNA. Sometimes two different chromosomes grab onto each other and then fail to separate. Scientists have observed both humans and mammals with fused chromosomes.
Humans and nearly all other species carry their genetic information in DNA, also known as deoxyribonucleic acid. The DNA of an individual can be found in almost all of their cells.
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