Ques:Cutting down trees has a negative impact on an ecosystem, and an ecosystem can be in a desert, a tropical jungle, an ocean or a pond. Given these facts, what type of impact does cutting down trees have on jungles among the following options: - dangerous - negative - uncontrolled - mechanical - unpredictable - growing - positive - Pollution

Ans:negative
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Ques:Sporangia produce spores that develop into tiny, heart-shaped gametophytes, and asexual reproduction is by spores produced in stalked sporangia . Given these facts, what by spores develop into tiny, heart-shaped gametophytes among the following options: - stealing seeds - graptolites - asexual reproduction - impregnating men - allow growth - Most plants - making babies - peachleaf willow

Ans:asexual reproduction
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Ques:Veins generally carry deoxygenated blood, and veins push blood toward the heart. Given these facts, what is carried toward the heart among the following options: - flow of electrons - kinetic energy - deoxygenated blood - the body's largest organ - Electrical energy - energy of moving objects - refraction of light - electromagnetic energy

Ans:deoxygenated blood
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Ques:Gene flow occurs when individuals move into or out of a population, and people are individuals, and each person has different needs. Given these facts, what happens when people flow into or out of a population among the following options: - genetic morphing - death - gene flow - movement - generic flow - interact - competition - gene expression

Ans:
gene flow
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