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 - I am not 100% Thank you

A added note I think 3 is A now - did a lil research....so A for 3

I think I may have messed up on #2 also - now I think it is B.... :( I was confused

that is 100% correct thanks

I can help you understand the correct answers for each question.

Question 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.

To determine the correct answer, we need to understand how freshwater invertebrates eliminate ammonia. Ammonia is a toxic waste product that needs to be eliminated from the body.

One common method of ammonia elimination in aquatic organisms is through diffusion across certain body surfaces, such as gills or skin. Since freshwater invertebrates lack gills, option B (simple diffusion across the gill membranes) is not applicable in this case.

Freshwater invertebrates typically do not convert ammonia to uric acid (option A), as this process is more common in terrestrial organisms. Similarly, converting ammonia to urea and eliminating it in urine (option C) is more commonly seen in mammals and terrestrial animals.

Therefore, the correct answer is D (simple diffusion across the skin). Freshwater invertebrates can eliminate ammonia directly through diffusion across their body surfaces, such as their skin.

Question 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.

To determine the correct answer, we need to identify the similarities in excretory processes between saltwater and freshwater fishes.

Both saltwater and freshwater fish need to maintain osmoregulation, which involves regulating the balance of water and salt in their bodies.

Option A (conserving water by producing small amounts of concentrated urine) is not applicable to saltwater fishes because they live in a relatively high-salinity environment, whereas freshwater fishes need to conserve water due to their environment. Therefore, this option is incorrect.

Option B (actively pumping salt across their gills) is correct. Both saltwater and freshwater fishes use active transport mechanisms to regulate the salt concentration in their bodies.

Option C (avoiding drinking water) is not a universal characteristic for saltwater and freshwater fishes. Some species of fish drink water, while some do not. This option is incorrect.

Option D (producing lots of watery urine) is incorrect because saltwater fishes excrete concentrated urine to conserve water, while freshwater fishes excrete large volumes of diluted urine.

Therefore, the correct answer is B (They both actively pump salt across their gills).

Question 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.

To determine the correct answer, we need to find the excretory characteristic shared by a garden spider and a sparrow.

Option A (converting nitrogenous waste to uric acid) is correct. Both spiders and birds (including sparrows) convert their nitrogenous waste, such as urea, into uric acid. Uric acid is a less toxic form of waste that is easily excreted.

Option B (producing lots of diluted urine) does not apply to spiders, as they do not produce urine. This option is incorrect.

Option C (excreting very concentrated salt solutions) is not applicable to either garden spiders or sparrows. This option is incorrect.

Option D (producing very dry feces) is true for both garden spiders and sparrows. Both of these organisms produce solid and dry feces.

Therefore, the correct answer is D (They both produce very dry feces).

I hope this helps clarify the correct answers for you!

1.D

2.A
3.D
4.B
5.A