Which object is created during the formation of a star? a nebula a protostar a supergiant a supernova

A protostar is created during the formation of a star

A star begins its life as a cloud of gas, which is mostly hydrogen and helium. Afterwards these particles experience a very weak attraction towards each other due to gravity. When these gas cloud becomes denser, the effect of gravity is to increase the pressure and temperature. The protostellar phase is the earliest one in the process of stellar evolution and a protostar is a very young star that is still gathering mass from its parent molecular cloud

B. A protostar

Explanation:

Just took the quiz on edge :)

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.