A student conducts an investigation studying the effect of the amount of different types of fertilizer on plant growh rate. He takes 20 plants from 4 different plant types growing each one over the period of 60 days and one group gets no fertilizer, measuring and recording data every few days. He makes sure each plant gets the same amount of water, soil and sunlight. What is the biggest flaw in this experiment?

a No constants
b Different types of plants
c No control group
d Not a large enough sample size

c

Explanation:

c

enzyme active site and substrate specificity

enzymes bind with chemical reactants called substrates. there may be one or more substrates for each type of enzyme, depending on the particular chemical reaction. in some reactions, a single-reactant substrate is broken down into multiple products

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.