No. Since the lice harm the person they live on it is parasitism.
they work hard for living
they work hard for living
No, the femur is not as hard as concrete. The femur is a bone in the human body that is strong and dense, but it is not as hard or rigid as concrete, which is a non-living material typically used in construction.
Hard Kissing: Is intense and fast, such as french kissing or the specific kind when you move excitedly. Soft Kissing: Is a shy, slow moving, living the moment feeling. Such as the "movies/human kissing".
they can be as hard as a rock
Yes, oak tree wood is harder than human bones. Oak wood is a dense hardwood with a higher level of hardness compared to human bones, which are composed of living tissue and are not as hard as wood.
Possibly because there are no examples of true commensalism in nature to find. If you think about it, it seems almost irrational to suggest that two species could have an interaction and one of those species would experience an absolute net zero effect on its ecology. Maybe we just haven't looked closely enough at the relationships presented in our textbooks. You can poke holes in every one out there. So, if we accept that the term Commensalism is at best a functional term and at worst a term of convenience, we can move on.
as hard as you can kick it!
yes
life scientist studies about living things for example bird,plant and human being
Without inventions the human race would just be another species of animal living in the wild, perhaps nesting in trees or caves, hard to be sure.
What do you think smartie? The earth will eventually run out of resources if you continue to harm the planet...destruction, hard living....duh? We will harm future generations.