How old is our planet Earth?

A. 6,000 years old
B. 4.6 billion years old
C. 4.6 million years old
D. We do not have enough information to accurately date the age of Earth.


Answer: B

Biology & Microbiology

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Myoglobin supplies ____ to fuel muscle activity

a. oxygen for aerobic respiration b. phosphate for ATP formation c. direct energy for white muscle fiber contraction d. glucose for lactate fermentation e. glucose for aerobic respiration

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The electron transfer chain is located ____

a. on the inner membrane of the mitochondria b. on the inner membrane of the chloroplasts c. in the fluid part of the chloroplast d. throughout the cytoplasm of the cell e. on the plasma membrane of eukaryotes

Biology & Microbiology

Under the redundancy hypothesis, if one species is removed from an ecosystem, then another organism in that ecosystem that occupies a similar niche will take its place, leading to minimal disruption

Indicate whether the statement is true or false

Biology & Microbiology

The cloudiness in the eye lens that blocks light on its way to the retina is called a(n) ________

Fill in the blank(s) with correct word

Biology & Microbiology