Which event occurred first in Earth's history?
What will be an ideal response?
a. Photosynthesis or eukaryotic cells?
Photosynthesis. b. Vertebrate animals or flowering plants? Vertebrates. c. Extinction of
dinosaurs or origin of hominids? Extinction of dinosaurs.
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________ is a condition in which there is air inside the thoracic cavity and outside of the lungs
A) Pneumothorax B) Pleuritis C) Pleurisy D) Hemothorax
Skin cells that undergo random changes as a person ages provide an example of a(n) _____ mutation.?
A) ?chromosomal B) ?gene C) ?somatic D) ?inherited
Voltage-gated potassium channels in a neuron's axon are triggered to open when membrane potential becomes more negative.
Answer the following statement true (T) or false (F)
What are the first-order neurons in the visual pathway?
A) Ganglion cells B) Bipolar cells C) Optic nerve fibers D) Amacrine cells E) Rods and cones