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timofeeve [1]
3 years ago
9

Which crustaceans form the base of many food chains

Mathematics
1 answer:
Anettt [7]3 years ago
4 0

Answer:

Step-by-step explanation:

Primary producers — including bacteria, phytoplankton, and algae — form the lowest trophic level, the base of the aquatic food web. ...

Some zooplankton including copepods, rotifers, larval stages of some fish and invertebrates are grazers and drift through the water grazing on phytoplankton.

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The product of 2 numbers is -24 and their sum is -5. What are the two numbers and why are they the two numbers?
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The numbers are (-8, 3) or (3, -8).

Step-by-step explanation:

  • Step 1: Given the product of the numbers are -24 and their sum are -5. Let the numbers be a and b. Form equations out of these details.

⇒ a + b = -5 ⇒ b = -5 - a

⇒ a × b = -24 -------- (1)

  • Step 2: Substitute the value of b in eq(1)

⇒ a × (-5 - a) = - 24

⇒ -5a - a² = -24

⇒ a² + 5a - 24 = 0

  • Step 3: Solve the quadratic equation for a.

a = (-5 ± √25 - 4 × 1 × -24)/2

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  • Step 4: For each value of a, find b.

When a = -8, b = -5 +8 = 3

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