The most likely total number of species on Earth is estimated to be between ________.
Fill in the blank(s) with the appropriate word(s).
6 and 12 million
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What part of the attached bacteriophage enters through the host cell wall?
A. The entire virus B. Only the enzymes necessary for replication C. The nucleic acid D. The nucleic acid and capsid E. The capsid only
Which skeletal muscle component includes all the others?
a. actin b. myofibril c. myosin d. sarcomere e. muscle fiber
Which is the correct sequence of structures through which light passes in the eye?
A) Lens ? pupil ? cornea ? aqueous humor ? retina B) Lens ? cornea ? vitreous humor ? retina ? aqueous humor ? pupil C) Cornea ? aqueous humor ? pupil ? lens ? vitreous humor ? retina D) Aqueous humor ? cornea ? lens ? pupil ? retina ? vitreous humor E) Pupil ? vitreous humor ? aqueous humor ? retina ? cornea
Identify and briefly describe the labeled structures in the cross section of the vertebrate embryo.
What will be an ideal response?