Which statement is a scientific theory?
a)the acceleration of an object increases as the force on an object increases.
b)all matter is made up of particles, called atoms, that are constantly moving.
c)a ray of light reflects off of a mirror at the same angle that it hits the mirror.
d)the total amount of mass present does not change during a chemical reaction.

Answer;

B)All matter is made up of particles, called atoms, that are constantly moving.

Explanation;

-A hypothesis is a limited explanation of a phenomenon; a scientific theory is an in-depth explanation of the observed phenomenon.

-A scientific theory is a series of statements about the causal elements for observed phenomena. A critical component of a scientific theory is that it provides explanations and predictions that can be tested.

-"All matter is made up of particles, called atoms, that are constantly moving" is a scientific theory providing explanation on the composition of matter.

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: grassland biomes are closer to the equator and receive more rain.

grasslands are biomes that are dominated by grasses rather shrubs and trees. savanna are biomes that exhibit grasses, shrubs and small tree as vegetation. grasslands are located near the equator of the earth. these are found in north america. savanna biomes are found in africa, south america, australia and india. grassland exhibit moderate climatic conditions, it receives   amount of rainfall higher than savanna.   therefore, savanna exhibit dry and hot climatic conditions.