← Checkpoint Science
Biology · 81 left
Quick drill · instant marking
Try it free — the AI marks 3 answers a day. A free account marks 30 a day.
Sign up free →
World population of Sumatran tigers
1960
1970
1980
1990
2000
2010
2020
0
400
800
1200
year
population
Look carefully at what the graph shows happening to the population.
The graph shows the world population of Sumatran tigers between 1960 and 2020. Write down two reasons for the trend shown in the graph.
[2 marks]
Type
Photo · Sign up
Write · Sign up
√ Symbols
$x$
a⁄b
xⁿ
xₙ
√
( )
×
÷
±
≈
π
θ
→
°
+ More symbols (IGCSE / A-Level — all subjects)
Calculus
ⁿ√
∫
∮
dy/dx
d/dx
∂
∑
∏
lim
∞
f′
∇
∝
Functions
sin
cos
tan
sec
cosec
cot
sin⁻¹
ln
log
logₐ
eˣ
|x|
Greek
α
β
γ
δ
ε
η
λ
μ
ν
ρ
σ
τ
φ
χ
ψ
ω
Δ
Σ
Π
Ω
Φ
Λ
Θ
Relations & logic
≠
≡
<
>
≤
≥
≪
≫
≅
∼
∴
∵
⇒
⇔
Sets & numbers
∈
∉
⊂
⊆
∪
∩
∅
∀
∃
ℝ
ℤ
ℕ
ℚ
ℂ
Vectors, matrices & stats
a⃗
â
𝐚
AB⃗
·
ⁿCᵣ
matrix
x̄
x̂
σ²
n!
Physics
×10ⁿ
Ω
μ
λ
ω
ρ
Δ
∝
≈
°C
Chemistry
₂
₃
₄
₅
₆
⁺
⁻
²⁺
²⁻
→
⇌
⟶
Δ
δ⁺
δ⁻
•
⦵
(s)
(l)
(g)
(aq)
Preview
📷 Tap to photograph your answer
Marked point by point against the mark scheme.
Check answer →
Stuck? Get a hint
Free
Guided Hint
— no answers, just a nudge
Close ✕
Thinking
.
.
.
One more nudge →
Let me try now
Worked solution
Show all steps
That's the full method. Now try one like it yourself.