I think the hydra lacks the specialized cells for touch and chemical detection. On the other hand earthworms have touch, light, vibration and chemical receptors along the entire body surface. Both of them are invertebrates (those animals without a backbone), they include insects, worms, jelly fish, spiders among other animals.
The common bile duct is formed by the union of the cystic duct and the common hepatic duct.
Answer: C
Explanation:
Viruses don't have cell walls that can be attacked by antibiotics; instead they are surrounded by a protective protein coat. Unlike bacteria, which attack your body's cells from the outside, viruses actually move into, live in and make copies of themselves in your body's cells
The question is incomplete. The complete question is:
We would expect the greatest difference in plant health between two groups of plants of the same species, one group with mycorrhizae and one group without mycorrhizae, in an environment _____.
A) where nitrogen-fixing bacteria are abundant.
B) that has soil with poor drainage.
C) that has hot summers and cold winters.
D) in which the soil is relatively deficient in mineral nutrients.
E) that is near a body of water, such as a pond or river.
Answer:
D) in which the soil is relatively deficient in mineral nutrients.
Explanation:
Mycorrhizae are mutualistic associations between fungi and the roots of plants. The fungus grows around and into the root and into the surrounding soil. The fungus absorbs essential minerals, especially phosphorus, from the soil for the plant. The plant provides the organic nutrients produced by photosynthesis to the fungus. Therefore, the plants with mycorrhizae exhibit better growth in mineral deficient soil than the plants without mycorrhizae.
An increase in the membrane permeability for a solute will result in an increase in the driving force for diffusion of that solute through the membrane. This statement is TRUE.
Surface area and porosity/permeability are the two variables that are most relevant to diffusion via a membrane. Slower diffusion will result from a membrane with less permeability or less surface area, which will obstruct molecule motion. More permeable cells can withstand cold and freezing more easily, but they could also become dehydrated. Living cells are suspended in an aqueous solution, and as the cells move through the solution, ice crystals begin to form in the solution around them, increasing the concentration of solutes outside the cells.
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