Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Q. What are the problems that vertebrates needed to solve to adapt to the terrestrial environment since they came from the aquatic habitat? How evolution does solve those problems?
The main problems vertebrates coming from water needed to solve to adapt to the terrestrial environment were the following: the problem of elimination of wastes in a medium where water is less available, the problem of protection against nocent solar radiation, the problem to avoid dehydration, the problem of gamete locomotion in the environment for fecundation, the problem of gas exchange, earlier done by direct contact of water with gills, the problem of body support, since it was water that played this role in fishes.
Solutions for the dehydration problem: thicker and impermeable skin, permeable and moist skin or to lose less water like in amphibians. Solution for the excretion problem: excretion of urea also excreted by uric acid or chondrichthyes, substances that need less water to be dissolved. Solutions for the problem of protection against radiation: skin pigments that filter harmful radiation, feathers, carapaces or hair. Solution for the gamete movement problem: internal fecundation except for most amphibians that have external fecundation. Solution for the gas exchange problem: appearing of lungs and airways. Solution for the body support problem: further development of bony and muscular structures, like claws and limbs.
The first evidence of implants dates back to 600 A.D. in the Mayan population. There are reports that the ancient Egyptians attempted intra-osseous implantation of animal teeth or
Celia is a nurse in a geriatric ward. She noticed that older persons in her care are having problems sleeping at night. She decided to introduce non-pharmocologic ways of relaxat
Q. Pulmonary Arterial System Changes ? a) Pulmonary Plethora With increased pulmonary arterial blood flow, pulmonary branches are visualized beyond the inner 2/3 of the lung
Guards for Machines and Equipment Various machines and equipment used for manufacturing require guards for protecting the operator from any injury. These machines include: Wo
Q. Sunlight used for sterilization? It possesses appreciable bactericidal activity under natural condition. The action is primarily due to content of the ultraviolet rays; howe
HOW ARE THE ORIGIN AND EVOLUTION OF ALGAE..
Chancroid Chancroid, caused by Haemophilus ducreyi, is rare in the US. A single dose of azithromycin or ceftriaxone is usually effective, but may be less effective in HIV-inf
Effect of Metamorphic Hormones on Gene Expression Effect of metamorphic hormones on gene expression in moulting and metamorphosing insects, the first report of a particular ho
CARE OF RECORDS Patient's/client's records are unquestionably a valuable documents. These should be made on paper of good quality and protected from soiling, and burning. Th
Why in inflammatory and infectious conditions may clinical signs related to the lymphatic system occur? The lymph nodes, or lymph glands, have lymphoid tissue that makes lympho
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd