Give an example of a hydroskeleton and explain how it provides the support necessary for movement
What will be an ideal response?
The sea anemone uses its internal gastrovascular cavity as a hydroskeleton. This cavity is surrounded by muscle cells that apply pressure to various parts of the bag-like structure. A force exerted on one region will cause a bulge in another. Since the anemone has layers of muscle that run at right angles to each other, it can coordinate these muscles to change its shape so that the body wall makes swimming movements.
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In a forest, trees that get more sunlight grow taller than other nearby trees. This is a form of ______
A. natural selection. B. directional selection. C. artificial selection. D. disruptive selection. E. stabilizing selection.
Many specialized cells, such as white blood cells, ____
a. remain in G0 until stimulated by external signals to reenter the cell cycle and divide b. remain in S until hormonal signals cause the cell to reenter the cell cycle and divide c. divide continuously and never transition to G0 d. mutate into other cell types by signals from bone marrow cells e. skip anaphase in order to avoid the high likelihood of mutation during this phase of mitosis
Which of these bones form the cheekbones in the skulls of mammals?
A) nasal bones B) fontanels C) palatine bones D) zygomatic bones
A nutrient medium that has all of its chemical components identified and their precise concentrations known and reproducible would be termed
A. enriched. B. synthetic. C. reducing. D. enumeration. E. complex.