23. Since DNA sequences in humans and chimpanzees are very similar
a. humans must have evolved from chimpanzees
b. chimpanzees must have single-stranded DNA
c. humans and chimpanzees must have a recent common ancestor
d. humans and chimpanzees are the same biological species
Not sure...?
26. Fish reproduce by all of the following ways EXCEPT
a. external fertilization, eggs
b. internal fertilization, live birth
c. internal fertilization, eggs
d. external fertilization, live birth
C?
30. Which of the following is usually characteristic of reproduction in a terrestrial environment?
a. external fertilization
b. internal fertilization
c. water-permeable eggs with no shells
d. both a and c
B?
33. Characteristics that give birds the energy they need to fly long distances are
a. strong breast muscles and wings
b. aerodynamic feathers and lightweight bones
c. divided ventricle and air sac in lungs
d. endothermic metabolism and fused bones
I was kind of stuck on this one, since I think it's all of them but I think it might be C?
Thanks
-MC
23. I don't know about single-stranded DNA, but I know humans did not evolve from chimpanzees. And we sure are not the same species. Anthropologists believe humans and chimps have a common ancestor.
26 and 30. I'm not sure, but I think you're right.
33. Isn't the key word "energy?" It seems to me that only one answer pertains to energy.
23. The correct answer is c. humans and chimpanzees must have a recent common ancestor.
To arrive at this answer, we need to understand the concept of genetic similarity between species. The fact that DNA sequences in humans and chimpanzees are very similar suggests that these two species share a common ancestor. Through the process of evolution, over millions of years, genetic changes occurred in the ancestral population, leading to the divergence of humans and chimpanzees as separate species.
26. The correct answer is b. internal fertilization, live birth.
To answer this question, we need to understand the different reproductive strategies employed by fish. Fish can reproduce in various ways, such as external fertilization (where eggs are released in water and fertilized externally) and internal fertilization (where sperm is directly transferred to the female's body). Further, fish can give birth to live young (viviparity) or lay eggs (oviparity). In this case, option b is the correct answer because it states that fish reproduce by internal fertilization and live birth, which is not a typical method for fish.
30. The correct answer is b. internal fertilization.
To answer this question correctly, we need to consider the characteristics of reproduction in a terrestrial (land) environment. In a terrestrial environment, where water is limited and the risk of desiccation (drying out) is higher, internal fertilization is typically more advantageous than external fertilization. Internal fertilization allows for the direct transfer of sperm from the male to the female, increasing the chances of successful fertilization. Thus, option b, internal fertilization, is the most characteristic of reproduction in a terrestrial environment.
33. The correct answer is b. aerodynamic feathers and lightweight bones.
To answer this question, we need to consider the adaptations that birds have for flying long distances. Birds have evolved several characteristics that make flight possible. While all of the options listed contribute to their flying abilities, option b, aerodynamic feathers and lightweight bones, are the most important characteristics. Aerodynamic feathers provide lift and maneuverability, while lightweight bones reduce energy expenditure during flight. The other options mentioned (strong breast muscles and wings, divided ventricle and air sac in lungs, endothermic metabolism and fused bones) are also relevant to flight, but they are not as directly linked to long-distance flight as aerodynamic feathers and lightweight bones.
I hope these explanations help! If you have any more questions, feel free to ask.