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When scientists apply this list of criteria to determine if a virus is alive, the answer remains unclear. Because of this, the debate of whether viruses are living or non-living continues. As the understanding of viruses continues to develop, scientists may eventually reach a final decision on this question.
Bone Basics and Bone AnatomyHave you ever seen fossil remains of dinosaur and ancient human bones in textbooks, television, or in person at a museum? It's easy to look at these and think of bones as dry, dead sticks in your body, but this couldn't be further from the truth.
How Long Can Seeds Last?You might be asking yourself, how long can a seed stay dormant? This is a question that scientists have tried to answer in many different ways.
Woolly Mammoths died out around 4000 years ago. We can’t find remains of most animals that died so long ago
Some cells, like skin cells, are constantly dividing. We need to continuously make new skin cells to replace the skin cells we lose. Did you know we lose 30,000 to 40,000 dead skin cells every minute? That means we lose around 50 million cells every day. This is a lot of skin cells to replace, making cell division in skin cells is so important.
The wood and grasses that fuel fires are made from living things. When fires burn this material, the flames can release the nutrients stored in dead plants. The ash from these fires can be good for new plants to grow. Fire is part of the life cycle. You can also think of fire as the opposite of photosynthesis.
Dead without Diffusion Worms breathe through their skin, using diffusion. Click to enlarge. While the complexity of the breathing systems across all animals is variable, one thing remains constant. The diffusion of oxygen (and carbon dioxide, as waste) across respiratory surfaces occurs in all of these animals.
The good bacteria found in yogurt are known as live cultures. That means they are still alive when you eat them. Yogurt usually contains a few different kinds of microbes. It’s made under controlled conditions to allow only the good bacteria to grow. Letting in bad bacteria might spoil the food and make it taste bad, or even make you sick.
Just a little bit of water is all they need to make a home. That’s why many species of water bears live on land. Some live in the watery layer that forms between dead tree leaves on a forest floor. Many live in mosses or lichens that trap water between their leaves and ruffles. Because they are not too fussy, they can be found all over the world.
Books and Dead Bodies. Like a body rising from the dead, biology came back to life around the 1400s. This was the beginning of the Renaissance in Europe. It marked the end of the Early Middle Ages and the start of new learning. Art, books, and science all became popular once again.