Orlando wrote on separate index cards four facts about cells. The four facts Orlando write are listed below:
1. Cell come only from existing cells
2. All cells contain hereditary information
3. All living things are made of one or more cells
4. A cell is the most basic unit of structure and function of all living things
He shuffled the index cards, spread them out on his desk, and asked Martha to pick
out the cards that describe the cell theory. Which cards did Martha correctly select?

the correct answer is c   with the systems

water is a polar molecule. a chemical bond is a force of attraction between atoms or ions. bonds form when atoms share or transfer valence electrons. atoms form chemical bonds to achieve a full outer energy level, which is the most stable arrangement of electrons. so, false

explanation:

in h2o molecule, two water molecules are bonded by a hydrogen bond but the bond between two h - o bonds within a water molecule are covalent. the greater the electronegativity difference, the more ionic the bond is. bonds that are partly ionic are called polar covalent bonds. nonpolar covalent bonds, with equal sharing of the bond electrons, arise when the electronegativities of the two atoms are equal.

c) 50% there are four chromosomes. after crossing over, 2 of the four have been changed. that means any gamete has a 2 in 4 chance or 50% chance of receiving the mutated chromosome.