Question: Q: What type of symmetry do echinoderms show? Read this paragraph and choose the correct option from the provided answers: As mentioned earlier, echinoderms show radial symmetry. Other key echinoderm features include an internal skeleton and spines, as well as a few organs and organ systems. Although echinoderms look like they have a hard exterior, they do not have an external skeleton. Instead, a thin outer skin covers an internal skeleton made of tiny plates and spines. This provides rigid support. Some groups of echinoderms, such as sea urchins ( Figure below ), have spines that protect the organism. Sea cucumbers use these spines to help them move. Choices: - mirrored - lateral - parallel - radial A:
Answer: radial

Question: Q: What is the opening formed between adjacent vertebrae for the exit of a spinal nerve called? Read this paragraph and choose the correct option from the provided answers: Figure 7.24 Intervertebral Disc The bodies of adjacent vertebrae are separated and united by an intervertebral disc, which provides padding and allows for movements between adjacent vertebrae. The disc consists of a fibrous outer layer called the anulus fibrosus and a gel-like center called the nucleus pulposus. The intervertebral foramen is the opening formed between adjacent vertebrae for the exit of a spinal nerve. Choices: - inferior vertebral notch - sympathetic ganglion - spinous process - intervertebral foramen A:
Answer: intervertebral foramen

Question: Q: Cutting forests and clearing land has also increased the amount of what in the atmosphere? Read this paragraph and choose the correct option from the provided answers: Because of human activities, there is more carbon dioxide in the atmosphere today than in the past hundreds of thousands of years. Burning fossil fuels and has released great quantities of carbon dioxide into the atmosphere. Cutting forests and clearing land has also increased carbon dioxide into the atmosphere because these activities reduce the number of autotrophic organisms that use up carbon dioxide in photosynthesis. In addition, clearing often involves burning, which releases carbon dioxide that was previously stored in autotrophs. Choices: - oxygen - smog - pesticides - carbon dioxide A:
Answer:
carbon dioxide