1.Many freshwater invertebrates eliminate ammonia by:
A. Converting it to uric acid and eliminating it with solid wastes.
B. simple diffusion across the gill membranes.
C. converting it to urea and eliminating it in their urine.
D. simple diffusion across the skin.******
2. Which of the following excretory processes do saltwater and freshwater fishes share?
A. The both conserve water by producing small amounts of concentrated urine.
B. They both actively pump salt across their gills. ********
C. The both avoid drinking water.
D. They both produce lots of watery urine.
3. What excretory characteristic does a garden spider share with a sparrow?
A. They both convert nitrogenous waste to uric acid. *********
B. They both produce lots of diluted urine.
C. They both excrete very concentrated salt solutions.
D. They both produce very dry feces.
My choices are marked with *******
Please help - Thank you (Never did get help from other website suggested) :(
1. To answer this question, we need to understand how freshwater invertebrates eliminate ammonia.
Option A: Converting it to uric acid and eliminating it with solid wastes.
Option B: Simple diffusion across the gill membranes.
Option C: Converting it to urea and eliminating it in their urine.
Option D: Simple diffusion across the skin.
To determine the correct answer, we can eliminate options that do not match the information we have. Freshwater invertebrates are unable to convert ammonia to uric acid (option A) because uric acid is not the primary nitrogenous waste product for freshwater organisms. Additionally, while simple diffusion (options B and D) is a way that some organisms eliminate waste, it is not the primary method for freshwater invertebrates.
The correct answer is option C: Converting ammonia to urea and eliminating it in their urine. Freshwater invertebrates produce urea as a less toxic alternative to ammonia, and they eliminate it through their urine.
2. To find the common excretory process shared by saltwater and freshwater fishes, we need to examine the options provided.
Option A: They both conserve water by producing small amounts of concentrated urine.
Option B: They both actively pump salt across their gills.
Option C: They both avoid drinking water.
Option D: They both produce lots of watery urine.
To determine the correct answer, we can eliminate options that are not true for both saltwater and freshwater fishes. While option A may be true for some freshwater fishes, it is not a characteristic shared by all fishes. Option C is not a relevant factor in this context. Option D may be true for some fishes, but it does not apply to all fishes.
The correct answer is option B: They both actively pump salt across their gills. Both saltwater and freshwater fishes have specialized cells in their gills that actively transport ions, including salt, to maintain the proper balance of electrolytes in their body fluids.
3. To identify the excretory characteristic shared by a garden spider and a sparrow, let's analyze the options given.
Option A: They both convert nitrogenous waste to uric acid.
Option B: They both produce lots of diluted urine.
Option C: They both excrete very concentrated salt solutions.
Option D: They both produce very dry feces.
To determine the correct answer, we can eliminate options that do not match the characteristics of spiders and sparrows. While option C may be true for some marine animals, it is not relevant to spiders and sparrows. Option B may be true for some animals, but it does not apply universally. Option D is partially correct for spiders but does not apply to sparrows.
The correct answer is option A: They both convert nitrogenous waste to uric acid. Both spiders and birds, including sparrows, excrete nitrogenous waste in the form of uric acid. Uric acid is produced by many terrestrial animals as a way to conserve water and eliminate nitrogenous waste in a concentrated form.
I hope this explanation helps you understand the reasoning behind the correct answers. If you have any further questions, feel free to ask!