Q: What makes echinoderms force water into the feet and move forward? Choices: - spring contractions - vacuum contractions - field contractions - muscle contractions A:
muscle contractions

(Question)
Q: Hydrogen sulfide is a noxious and toxic gas produced from decaying organic matter that contains what? Choices: - tin - methane - helium - sulfur A:
(Answer)
sulfur

Ques: Q: What forms when the metal sodium gives up an electron to the nonmetal chlorine? Choices: - covalent bond - van der waals force - hydrogen bond - an ionic bond A:
Ans: an ionic bond

(Q).
Q: What is the skeleton of the cell? Choices: - cytoplasm - cell membrane - cell wall - cytoskeleton A:
(A).
cytoskeleton

Ques:Q: What is the term for the complete set of genes and alleles within a population? Choices: - the ancestral pool - the chromosomal pool - the biodiversity pool - the gene pool A:

Ans:the gene pool

Ques:Q: When a rock is altered by heat from a nearby magma, what occurs? Choices: - sublimation - evaporation - form metamorphism - contact metamorphism A:

Ans:
contact metamorphism