1. Calculate If 1000 units of energy are available at the producer level of the energy pyramid, about
how many units are available for first-level con-
sumers? Second-level consumers? Third-level
consumers?

first-level consumers- about 100units

Second-level consumers- about 10units

Third-level consumers- about 1unit

Explanation:

A food chain represents the series of energy transfer from one organism to another. This energy is transferred when one organism feeds on another organism. A food chain always starts with a PRODUCER, which is an organism capable of producing its own food via photosynthesis. The producer creates the energy that is transferred as the food chain progresses.

However, only about 10% of the available energy in one organism is transferred to another, this is because most of the energy (about 90%) is lost as heat when the organism undergoes metabolic activities. Hence, if 1000units of energy are available at the producer level, a primary/first level consumer will feed on the producer and 10/100 × 1000 = 100units of energy will be available for the primary/first level consumer.

Likewise, 10% of 100units= 10 units of energy will be available for the second level consumers when it feed on the first level consumers. Lastly, 10% of 10units = 1 unit will be available for third level consumer when it feeds on second level consumer.

answer:

convection currents in the magma drive plate tectonics. heat generated from the radioactive decay of elements deep in the interior of the earth creates magma (molten rock) in the aesthenosphere. the aesthenosphere (70 ~ 250 km) is part of the mantle, the middle sphere of the earth that extends to 2900 km.

the correct answer in apex is tissue development, i know because i just had this question