A) nervous system
B) a mouth
C) stinging cells
D) spicules
Answer:
A mouth
Explanation:
The answer is that cnidarians lack triploblastic development. Cnidarians, such as jellyfish, sea anemone, and hydra, exhibit diploblastic development. This means that they have only two germ layers: the ectoderm and the endoderm. To understand triploblastic development, let's break it down. Triploblastic development refers to the formation of three germ layers: the ectoderm, the mesoderm, and the endoderm. These germ layers give rise to different tissues and organs in the body. In contrast, cnidarians lack the mesoderm layer. The mesoderm layer is responsible for forming muscles, connective tissues, and other internal structures. Since cnidarians do not have this layer, they are considered diploblastic. Let's use an example to illustrate this. Imagine you have a triploblastic organism, like a human. In a human, the mesoderm layer gives rise to muscles, which allow us to move. But in cnidarians, since they lack the mesoderm layer, they do not have true muscles. So, to summarize, cnidarians lack triploblastic development because they do not have the mesoderm layer. Instead, they exhibit diploblastic development, with only two germ layers: the ectoderm and the endoderm
In the situation where Jeremy is digging in the garden and feels the spade hit a rock, the functioning of sensory, relay, and motor neurons is crucial in his body's response to this stimulus.
When Jeremy was digging in the garden, he felt the spade hit a rock. This is sensation was facilitated by sensory neurons which picked up the external stimulation and sent the information in the form of electrical impulses from the nerves in his hands towards his spinal cord and brain. This sensory information travels to the brain via relay neurons, which are also known as interneurons. They reside within the central nervous system and transmit the signals from sensory neurons to appropriate areas of the brain for processing.
Upon processing the sensory data, the brain forms a motor response which is relayed back towards the muscles in his arms to stop digging. The 'stop digging' response is sent through motor neurons, which transmit the signals from the brain to the muscles in Jeremy's arms, causing him to stop the movement of the spade.
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B. A group of penguins
C. A set of pelicans
D. An assembly of dolphins
Answer:
D. An assembly of dolphins
Explanation:
The student should place all materials in an open metal container and autoclave the container.
The student should carry out procedure C, which is to place all materials in an open metal container and autoclave the container. Autoclaving is a process that uses high pressure and steam to sterilize materials. This is the most effective method for disposing of highly pathogenic bacteria, as it ensures that all bacteria are killed.
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The first one is that transport proteins in the cell membrane ' Pick up ' molecules from outsides the cell and carry them in , while using energy in the process
The second method is that the the cell membrane surrounds a particle and takes it in
I hope that's help !