15. Màng nguyên sinh chất không có đặc tính nào dưới đây: A. Khảm protein.
B. Lỏng.
C. Thấm chọn lọc.
D. Cân xứng

Explain how fossils scientists make discoveries about the lives of organisms and about how environments have changed over time. plz hurry up it time

Identify the type of energy used in each action. the flexing of an arm muscle: a signal transduction process by a neuron: a ball at the top of a hill: 1. electrical energy 2. mechanical energy 3. gravitational potential energy

How does the study of genetic disorders such as pku biologists understand normal alleles?