Symbiosis is the process by which an organism may coevolve to interact closely with another organism.


Symbiosis between Clownfish and sea anemone. The fish protects the anemone from anemone-eaters, the anemone protects the fish from fish-eaters.


Some symbiotic relationships are obligate, meaning that both symbionts entirely depend on each other for survival. For example, many lichens consist of fungal and photosynthetic symbionts that cannot live on their own. That is called mutualism because both of the organisms benefits each other.Image

Another type of symbiosis is commensalism


The relationship between hermit crab and sea-anemone is an excellent example of Commensalism.

Hermit crab lives inside empty shell of mollusc. The sea anemone inhabits the outer surface of being unaffected in a relationship.Commensalism resutls in one organism benefiting and one being unaffected in a relationship.

Paristism is a relationship in which one organism benefits and the other one is harmed.
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Chameleon have three basic adaptation:

1-Chameleon’s skin pigment cells can change color depending on temperature, mood, and during breeding. Basically they communicate with other chameleons through slight color changes. 

2-Their eyes are independent so they can move them any direction. This adaptation can help them to see what’s going on around it.It can also help them to look out for predators, because they can’t run very fast

3-They have a long tongue about the length of their body. It has a sticky substance at the end so the chameleon can get his/her prey in an instant. It is useful to catch their prey fast so its prey will not escape. It’s tongue can shoot so fast, the human eye can hardly see it. The chameleon has a long tail that acts as fifth arm. When it is no use the tail is all coiled up. Its tail is can be very useful because it can balance on a thin branch, its tail also can help it to stay very still.

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Sex linked is the phenotypic expression of an allele related to the chromosomal sex of the individual. This mode of inheritance is in contrast to the inheritance of traits on autosomal chromosomes, where both sexes have the same probability of inheritance. Since humans have many more genes on the X than the Y, there are many more X-linked traits than Y-linked traits.

A particularly important category of genetic linkage has to do with the X and Y sex chromosomes. These not only carry the genes that determine male and female traits but also those for some other characteristics as well. Genes that are carried by either sex chromosome are said to be sex linked.


Here you have a page in which there are some activities to understand Sex linked traits:


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