ati teas 7 science

Correct Answer: D

Rationale: The correct answer is D: Volume. Volume refers to the amount of space occupied by an object and is measured in cubic units. It is calculated by multiplying the length, width, and height of an object. Mass (A) is the amount of matter in an object, density (B) is the mass per unit volume, and weight (C) is the force of gravity acting on an object. Therefore, Volume is the only property that directly relates to the amount of space occupied by an object, making it the correct answer.

Correct Answer: D

Rationale: Certainly! The correct answer is D because saltatory conduction is faster than normal nerve conduction (A), occurs from one node of Ranvier to the next (B), and only occurs in myelinated neurons (C). This process involves the rapid transmission of action potentials in myelinated axons, where the impulse "jumps" from one node of Ranvier to the next, skipping the myelinated regions in between. This allows for faster conduction speeds compared to continuous conduction in unmyelinated neurons. Therefore, all of the statements in options A, B, and C are accurate descriptions of saltatory conduction, making option D the correct choice.

Correct Answer: D

Rationale: The correct answer is D because chromosomal nondisjunction can lead to various genetic disorders such as Down syndrome (A), caused by an extra chromosome 21. Nondisjunction can also result in Turner syndrome (B) in females due to the absence of one X chromosome, and Klinefelter syndrome (C) in males with one or more extra X chromosomes. Therefore, all the options are potential consequences of chromosomal nondisjunction.

Correct Answer: B

Rationale: The correct answer is B: Neuron. A neuron is the basic structural and functional unit of the nervous system because it is responsible for transmitting electrical and chemical signals within the nervous system. Neurons have three main parts: dendrites, cell body, and axon. Dendrites receive signals from other neurons, the cell body processes these signals, and the axon transmits signals to other neurons or to muscles and glands. The other choices, A: Axon, C: Dendrite, and D: Synapse, are all components of a neuron but do not individually represent the complete functional unit of the nervous system.

Correct Answer: A

Rationale: The correct answer is A: Convergent evolution. Dinosaurs evolving feathers before birds supports convergent evolution because it shows unrelated organisms (dinosaurs and birds) developing similar traits (feathers) independently to adapt to similar environmental pressures. This scenario is not an example of divergent evolution (B) where related organisms evolve different traits. It also does not demonstrate coevolution (C) where two species influence each other's evolution. The extinction of dinosaurs due to an asteroid impact (D) is not directly related to the evolution of feathers in dinosaurs before birds.