BACKGROUND: Isopods shape features are sensitive and respond to several selective pressures which may result in variations of these features. These pressures might reflect the heterogeneity of the environment where an animal lives. Land isopods _Porcellionides pruinosus_were collected from an agricultural field. Landmarks geometric morphometrics was applied to evaluate its shape changes during two different seasons. The present work aims ... Read more

Geometric-morphometric analysis is growingly used to quantify/analyze biological forms and discriminate among subtle variation in shape. The hermit crab “_Clibanarius __signatus__”_ showed subtle heterochely; therefore, geometric morphometric analysis helps to determine visually these shape changes. Individuals of “C. signatus” were collected from a mangrove site on the Egyptian Red Sea coast. The present study aimed to: "1" detect the different ... Read more

ABSTRACT BACKGROUND: The aquatic Acari are known as water mites and occupy a wide range of habitats. The freshwater mites, Unionicola aegyptiaca, were collected from the freshwater mussel, Caelatura aegyptiaca, River Nile, Sohag,Egypt. The present paper focuses on the structure of the cuticle and musculature of freshwater mite, U. aegyptiaca. RESULTS: Histologically, the cuticle consists of two main layers: epicuticle ... Read more

This study gives highlights on the biodiversity of spiders in an olive trees orchard, a lemon trees orchard, and webs of Cyrtophora citricola at Jazirat Shandweel District, Sohag Governorate, Egypt. In addition, it gives a preliminary list of spiders based on the main taxonomic characters. The sampling was carried out weekly or monthly during the period: September, 2015 to January, ... Read more

Two oribatid mite species belonging to the genus Malaconothrus, namely _Malaconothrus ramadani_ sp. n. and _Malaconothrus transversus_ sp. n., were described as two new species. They were collected from the roots of the floating aquatic plant, Eichhornia crassipes in River Nile, Girga city, Sohag Governorate, Egypt. The first species, _Malaconothrus ramadani_ sp. n., is clearly characterized by zigzag-like lateral margins ... Read more

1. Darwin's theory of natural selection to explain evolution is also known as A. Descent with modification. B. Inheritance of acquired characteristics. C. Uniformitarianism. D. Catastrophism. 2. Lamarck's theory of evolution included the idea that A. There is a natural force in all living things that pushes them toward perfection. B. Local catastrophes cause mass extinctions of species. C. Species ... Read more

Question 1. This natural philosopher proposed that evolution resulted from the inheritance of acquired characteristics - for example, giraffe offspring acquired longer necks because their parents stretching to reach higher leaves. * Jean-Baptiste Lamarck * Charles Lyell * Alfred Wallace * Thomas Malthus Read more

Briefly writ on how NASA in 1996 supported the Cosmic theory of evolution? Read more

* Evolution is one of the most important and critical ideas that the human mind has created over many years. Discuss? Read more

2. كيف يمكن دراسة سلوك أحد الحيوانات؟ وضح مع أمثلة؟ Read more