Construct data tables with correct headings and SI units, plot appropriate graph types (bar chart, line graph, scatter graph), draw a line of best fit, and calculate the gradient of a straight-line graph
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Question 1 of 3
Scientists examined early embryos of three vertebrate species—a frog, a chicken, and a mouse—at three developmental stages. The table shows whether each embryo has a (A) tail bud, (B) pharyngeal (gill) slit, and (C) notochord (✓ = present, ✗ = absent). Stage 1: Frog (A✓, B✓, C✓) Chicken (A✓, B✓, C✓) Mouse (A✗, B✗, C✓) Stage 2: Frog (A✓, B✓, C✓) Chicken (A✓, B✗, C✓) Mouse (A✗, B✗, C✓) Stage 3: Frog (A✗, B✗, C✗) Chicken (A✗, B✗, C✗) Mouse (A✗, B✗, C✗) Based on this pictorial data, which conclusion best identifies a relationship among these species that is not evident from the adult forms alone?
Question 2 of 3
The chart below shows three embryos at the same early developmental stage. - Frog embryo: tail, gill slits, limb buds - Chicken embryo: tail, gill slits, limb buds - Human embryo: tail, limb buds (no gill slits) Which similarity shown in the embryos provides the strongest evidence that these three species share a common ancestor?
Question 3 of 3
The diagram below shows three side‑by‑side drawings of the gastrula stage of embryos from a frog, a chicken, and a human. In each drawing the three germ layers—ectoderm (outer), mesoderm (middle), and endoderm (inner)—are labeled, and a table indicates that each embryo also has a notochord at this stage. Which conclusion is best supported by this pictorial data?
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