If one person in a family has a cancerous cell, it can easily be passed through the family as cells multiply very rapidly. for exaple stem cells can change into any cell including a cancerous cell.
Mutualism- Both organisms benefit from each other, for example bees and flowers, Bees help pollinate and the flowers give the bees nectar needed to make honey.
Commensalism- one organism benefits and the other stays neutral. For example, a bird and a tree, The tree gives the bird a home and the tree stays unaffected
Parasitism- One organism benefits and the other does not. For example, dogs and fleas, the fleas get to eat and the dogs get to suffer from the bites/ they can get sick.
Human brain weighs up to 1300 to 1400 grams and in length it is around 14 to 15c long
1. The heart muscle cells need plenty of oxygen and nutrients so it needs its own blood supply.
2. The heart needs to have a blood supply to get ride of wastes.
Hope that helps. -UF aka Nadia
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