Topic content:
Observe the following figure. The shaded part shows the common features of the four animals in the figure. This feature is
A. In vitro fertilization
B. Body temperature constancy
C. Asexual reproduction
D. Spine in the back
Best answer:
D
Answer analysis:
Kangaroo is a mammal, pigeon is a bird, crucian carp is a fish, lizard is a reptile. The common feature of the four animals is that they all have spines and are vertebrates.
Test core:
The concept and basis of biological classification: Biological classification is a basic method of studying biology. Biological classification is mainly based on the similarity of organisms (including morphological structure and physiological function, etc.), to divide organisms into different grades such as species and genera, and to scientifically describe the morphological structure and physiological function of each group, so as to clarify the kinship and evolutionary relationship between different groups. The classification is based on the characteristics of biological morphology, structure and physiological function.