Homeostasis is the equilibrium of a cell.
Autotrophs make their own food through photosynthesis.
Mitochondria undergoes cellular respiration and is often referred to as the "powerhouse of the cell".
I have reason to believe that 2 is the answer, because since all individual pathogens are the same, they will all react in the same way to the antibiotic. thus natural selection will exterminate them the fastest.
Keratin is responsible for skin color. The more the melanin in the skin, the darker the skin color of the person. Collagen and keratin makes up nails and hairs. Elastin is a connective tissue that connects the epidermis and the dermis. The dermal papillae nourishes the root hairs.
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Chromoplast is that plastid which is found in the cells of yellow petals.
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Pandas are classified as herbivores despite their taxonomic classification as a carnivore.