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Valentin [98]
3 years ago
12

Every november, tens of thousands of sally lightfoot crabs on christmas island leave their rain forest habitats at the same time

. they march across the island to the sea in huge groups, arriving just in time to mate at high tide. about a month later, tens of thousands of baby crabs march back across the island to the rain forest. based on this information, what type of fertilization would you expect to discover in this species?
Biology
2 answers:
Charra [1.4K]3 years ago
4 0
The type of fertilization that one would expect to find in this specie is EXTERNAL FERTILIZATION. External fertilization is the type of fertilization in which the male sperm fertilize the female eggs out of the female's body. This type of fertilization usually occur in aquatic environment. 
Helga [31]3 years ago
3 0

Answer:

External fertilization

Explanation:

Synchronized release of gametes to ensure fertilization is characteristic feature of external fertilization. The given information suggests that the crabs exhibit external fertilization. All the crabs move towards sea at the same time to synchronize the release of gametes. External fertilization of these gametes and hatching of fertilized egg release baby crabs.

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Why does the actions of the thymus demonstrate a close functional connection between the lymphatic system and the endocrine syst
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The Thymus is a unique gland which protects the body against autoimmunity when the immune system act against itself.Hence the Thymus plays a significant role the dual systems i.e.,the lymphatic system (body’s defensive mechanism) and the endocrine system

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The Thymus is special gland located anteriorly to the chest directly behind the sternum and in between the lungs. Active until puberty and gradually shrinks to become fat after puberty.

Function: Prior to birth and during childhood thymus engage in producing and maturation of T-lymphocytes or T-cells a particular type of white blood cells which defence the body against infectious disease germs.Though the organ does not function throughout the life span but it plays a significant role protecting the body against autoimmunity refers to an immune system works against itself .Therefore the thymus plays a key role in lymphatic system and an endocrine system.

Secretion:Thymus secretes Thymosin a hormone it instigates the development of T-Cells ( disease resisting cells) Thymosin stimulates the development of T-Cells until a human attains its puberty. At the age of 75 thymus becomes a fatty tissue.

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