Which two statements explain ways in which cells get nutrients? A. Transport proteins help molecules cross cell membranes.
B. A chloroplast converts energy from sunlight into organic matter.
I C. The nucleus provides the instructions for making proteins from
amino acids.
D. Mitochondria change energy stored in organic compounds into a
usable form.
help plz

An atom of lithium-7 has an equal number of(1) electrons and neutrons(2) electrons and protons(3) positrons and neutrons(4) positrons and protons

Asubstance is held in an open container. its particles move past one another at random speeds but do not leave the container. heat is removed from the system, and the particles slow down. when enough heat is removed, the particles no longer have enough speed to overcome the weak attractive forces between them. when this happens, the substance enters its solid state. the process described above is known as .

Calculate the temperature rise when 0.2g of propane is used to heat 400cm cubed of water.