Answer:
I think the heart
Explanation:
the heart pumps blood to everything else in the body and keeps everything running.
During prophase I, all four chromatids of the two homologues become closely associated as a result of pairing, forming a structure known as a tetrad or bivalent.
<h3>What is a tetrad?</h3>
A tetrad is a structure formed during the prophase I stage of meiosis I whereby two homologous chromosomes pair together.
Meiosis occurs in two stages of division namely;
- meiosis I
- meiosis II
In meiosis I, homologous chromosomes are separated but are first paired during the prophase stage to form the tetrad or bivalent structure.
Therefore, during prophase I, all four chromatids of the two homologues become closely associated as a result of pairing, forming a structure known as a tetrad or bivalent.
Learn more about tetrad at: brainly.com/question/12793757
Each tissue is an organized assembly of cells held together by cell-cell (more...) In epithelial tissue, by contrast, cells are tightly bound together into sheets called epithelia. The extracellular matrix is scanty, consisting mainly of a thin mat called the basal lamina, which underlies the epithelium.