What is the difference between periderm and bark?
543036
The periderm is the outer bark of a tree.The periderm is a secondary tissue that replaces epidermis in roots and stems, and which consists of phellem, phellogen, and phelloderm (it includes dead tissues). while the inner bark is called the phloem,It conducts usable food from the leaves to the cambium to nourish it or to storage areas in the wood (it includes living tissues)and consists of  of alternating wedges of sieve tube tissue and radial parenchyma, most of the former crushed by secondary growth.
930901
No they are different chemicals...;
742185
The dermal papillae would be akin to the root or the progenitor to the hair.  The cells of the dermal papillae control development, differentiation and cycling of the hair follicles
604092
inner bark of the pine to relieve coughs & bark and leaves of willow to treat cuts, sores and skin lesions. hope this helps!
25918
There are a lot of kinds of "hair". Each species of mammal has at least one kind of "hair" or fur. Many species have several different specialized types. For example, cat whiskers are very different from regular cat fur in texture and length. One of the main differences in hair is whether it is determinate in length (grows to a certain length and stops) or indeterminate in length (grows for as long as it is alive.) Humans have both kinds in different places on the body. Head hair, scalp and face, is indeterminate. Body hair, arms, underarms, legs, pubic area, fingers and toes is determinate. The only determinate hairs on the head are normal eyebrows, ear hair and nose hairs. I think the reason is obvious. "Wild hairs" are determinate hairs that have encountered a genetic failure. The length possibilities of each type of hair from sheep's wool to seal fur are genetically determined.  Pubic hair is a secondary sex characteristic that signals availability for mating. It is not designed to cover, conceal, protect, or warm the area that produces it. It may have some scent retaining or focusing function too. This is still debatable. I hope this helps.
568980
A frog jumps and a toad walks.\n\nA frog has usually wet smooth skin, which gives feeling of colder animal. And a toad has a dry skin, of different texture, like with small warts on it.\n\nThey both are very nice. However it is not advisable to touch a toad much, because this animal, if scared, may excrete a burning fluid, not good for alergic people.\n\nI live in Europe. There are much more different frogs of many colours (and toads, I think) in the world, which may be different, also from toxicologic perspective.
385873
Your skin is made up of two layers. The outer layer is called the epidermis and the lower level is the dermis. The outer layer (epidermis) produces an oily substance called sebum. You can see this substance when you touch a window or mirror and your "oily" fingerprint is left there. One job sebum does is it keeps water out of your skin—a job that it does very well. However, after long periods of time in a swimming pool, shower, or bathtub, much of the sebum is washed off and your outer layer of skin starts to absorb water. As it absorbs water it swells, but since the epidermis is "tied" down to your dermis in certain spots, it expands more where it is not "tied" down and this causes your skin to wrinkle.
1161873
Dingoes don't bark because they are one of the most primitive dog breeds in the world. That means they share a lot of traits in common with wolves, including not barking as adults and only having one breeding season each year.\n\nAll dogs are descendants of wolves, but most breeds have been heavily modified in the 30, 000 years or so since they were first domesticated. Dingoes have been modified far less than any other breed and so retain a lot of wolf traits.\n\nDingoes and wolves do bark as pups, and they will very rarely yap as adults.
767036
Actually, transpiration is the evaporation of water from leaves.  Guttation is a visible secretion of fluid from the leaves.\n\nMost of the water lost from a leaf goes through the stomata when the stomata are open.  The stomates open in order to allow CO2 into the leaf.  The stomates are controlled by conditions within the leaf.  \n\nThe cutin is a protective layer over the epidermis that prevents water loss.  The plant would have no control of the rate of transpiration if it only relied on the cutin.
639822
I read once where thy think that nails on chalkboard and stuff like that are similar to our warning screeches when we were more primitive primates.  They make our hair stand up on end and bug us.  Just like a warning sound should do.  Makes sense to me until I hear a better explanation.
12640
none, but it will seem like the fingernails and hair will due to the skin becoming tighter due to moisture loss. So the skin pulls back to show more of the nail bed and hail folicle.
194772
It dies.\n\nThe outer layers of bark - and just under that - are the vascular like systems that transport water and nutrients to the leaves - just like your veins. Now, imagine someone cuts all your veins and arteries up - you bleed to death. Even if the tree does not appear to "bleed" ringbarking can still kill if it stops the flow of water/nutrients from the roots and leaves and back again. \n\n... or something. Try wikipedia.
157168
I'd say acid. A base will corrode the skin, but an acid will burn. Trust me, it hurts.
65903
Actually, BOTH stop growing.\n\nOnce a hair has been growing for  a certain period of time, that hair falls out, and a new hair begans growing from the follicle.\n\nThe differience is that that time period is much shorter for the hairs on your arms than on the hairs on your scalp.\n\nA possible explanation is that are brain is one of the most sensitive and important parts of the body, and requires more protection from the weather, but really it's just how we turned out.\n\nMaybe it's just that we prefer people who aren't going bald, but don't look like an ape either. Those people have a higher chance of producing offspring, etc.
709313
a pimple is a lot smaller, and is filled with pus, which is white in color. a boil is HUGE, and filled with blood plasma, which is clear. also, there is a lot more pain with a boil than with a pimple.
55416
read these sites they provide helpful information :\nhttp://animaldiversity.ummz.umich.edu/site/topics/mammal_anatomy/hair.html\nhttp://dermatology.about.com/cs/hairanatomy/a/hairbiology.htm\nhttp://www.aad.org/professionals/Residents/MedStudCoreCurr/DCHairFollicles.htm\n\nGood luck
353328
Neither.\nThey are composed largely of keratin, very closely related to the keratin found in skin.  They are made up of cells, but living ones, not dead.