Answer:
B or D
Explanation:
think of it how you use chalk on a chalk board, its less friction using chalk instead lets say a marker on a white board.
Appropriately named, <u>slow pain </u>oftentimes is not detected until seconds or even minutes after an injury; this is due to the activation of chemically sensitive pain receptors.
Explanation:
According to physiology of pain, slow pain arises when unmyelinated C fibers of the muscles are activated. This is pronounced as a dull and aching pain and is more diffuse in nature rather than fast pain which are more acute and rapid.
Most of the times this pain will not be detected immediately after the stimulus like an injury but may start slowly.
Slow pain can also be burning, throbbing or even nauseous. Chronic pain conditions mostly are characterized by slow pain.
Slow pain is elicited by stimuli like mechanical, chemical or thermal which are received by the chemically sensitive pain receptors on the skin or other organs of the body.
Answer: A and D
Explanation: Sclerenchyma cells are thick cells that provide support in plants. They have thick cell walls lined with lignin. They possess extremely thick cell walls which gives rigidity and support to the plant body. Their main and primary function is to give support and structure to the plant.
Sclerenchyma cells don't have protoplast that mean the cells are dead at maturity.
Answer:
Carnivorous predators.
Explanation:
Cambrian evolution took place about 541 million years ago. Sudden increase in Oxygen in the Ocean helped the complex organisms and predators to emerge. To survive among those predators, every species tried to develop complex body parts like shells, spines etc. Take for example Trilobites. They had flattened, segmented and plated bodies with spines to help them survive among the increasing number of predators in the sea.
