18. 3 auditory ossicles are present in A) vertebrates B) reptiles C) mammals 19.

Question

18. 3 auditory ossicles are present in A) vertebrates B) reptiles C) mammals 19. In male mammals excretory and reproductive systems share D) birds and mammals A) testes B) vas deferens C) urethra D) prostate E) seminal vesicle 20. A) threatened A species in danger of extinction throughout all or significant portion of its range is B) endangered C) invasive D) endemic 21. Protection from radiations is due to A) ozone layer 22. Introduced species in southern USA is D) all of these D) sea kelp B) magnetic field of earth C)ionosphere A) otter B) water hyacinth C) kudzu 23. A population's carrying capacity A) remain constant over time B) increases as per capita growth rate decreases C) can change as environmental conditions change D) can never be exceeded

Explanation / Answer

Please find the answers below:

Answer 18: Choice C (Presence of three auditory ossicles, i.e. malleus, incus and stapes, is a characteristic of mammals)

Answer 19: Choice C (Urethra remains the common passage for urine as well as semen in male urinary system)

Answer 20: Choice B (An endangered species is the one which is on the verge of extinction throughout the globe)

Answer 21: Choice D (Multiple parameters help in protecting the individuals on earth from harmful rays, such as the protective environment, ionosphere, magnetic field etc)

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