Home › Certifications › 7th Grade Science › Evolution and Natural Selection
16 multiple-choice questions and 8 flashcards on Evolution and Natural Selection, about 11% of the 7th Grade Science bank. Every one carries a written rationale.
Evolution and Natural Selection is one of 5 chapters in CoStudy's 7th Grade Science (Life Science) bank, and it holds 16 of the bank's 150 multiple-choice questions — roughly 11% of the total. That proportion is not arbitrary: chapters follow the certifying body's published exam outline, and the number of questions in each is set by that domain's published weight, so the share of your practice time this chapter takes matches the share of the real exam it accounts for.
Studying by chapter is worth doing once you have a diagnostic score. A single overall percentage tells you whether you are close; it does not tell you which domain is dragging. Working a weak chapter in isolation, and re-testing it in isolation, is the fastest way to move a score that has stalled — and it is why the mock exams in CoStudy report by domain rather than as one number.
1 questions drawn from this chapter, with the full rationale shown — the controlling principle behind the right answer, and why each wrong option tempts and fails.
A study shows population X crashed after the removal of its predators. This most likely happened because:
Answer: D — The population of X overshot its carrying capacity and depleted resources
Without predators, prey populations grow unchecked, eventually exhausting food/habitat and crashing. This is the predator-prey population cycle. (A) X is the prey; (C) weather is unrelated; (B) disease can be a factor but overpopulation/resource depletion is primary.
1 cards from the 8 in this chapter.
What is 'evolution'?
Change in species' inherited traits over many generations.
These are a sample. The full Evolution and Natural Selection chapter runs 24 items with per-chapter progress tracking, on the web and in the iOS app.
Open 7th Grade Science in CoStudy →