In a frog embryo, gastrulation _____

A) produces a blastocoel displaced into the animal hemisphere
B) occurs along the primitive streak in the animal hemisphere
C) proceeds by involution as cells roll over the lip of the blastopore
D) occurs within the inner cell mass that is embedded in the large amount of yolk


C

Biology & Microbiology

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Which element is considered an essential macronutrient for plants?

a. oxygen b. boron c. lithium d. silicon

e. molybdenum

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Clarice, a dental hygienist, knows she cannot work on a patient with an infected oral cavity. A quick and effective way to determine whether an infection in the mouth exists is to feel for swollen ________ below the jaw

Fill in the blank(s) with correct word

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Which essential nutrient is most likely to leach from the soil?

A) Ca2+ B) Mg2+ C) K+ D) NO3?

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