I believe its (B). Giving up a neutron
        
             
        
        
        
Answer:
In biology, the smallest unit that can live on its own and that makes up all living organisms and the tissues of the body. A cell has three main parts: the cell membrane, the nucleus, and the cytoplasm. ... Parts of a cell. A cell is surrounded by a membrane, which has receptors on the surface.
The heart consists of four chambers in which blood flows. Blood enters the right atrium and passes through the right ventricle. The right ventricle pumps the blood to the lungs where it becomes oxygenated.
Explanation:
 
        
             
        
        
        
Answer: Equation for photosynthesis is carbon dioxide + water + sunlight→ Glucose + oxygen
In light dependent reactions, energy in form of solar energy is absorbed and converted to chemical energy.
Explanation: During photosynthesis, sunlight is absorbed by the light absorbing pigment called chlorophyll. The absorbed solar energy is converted into chemical energy using carbon dioxide and water as the starting materials with the release of oxygen. The equation is 6 CO2 + 6 H2O + solar energy --> C6H12O6 + 6O2. 
Photosynthetic reactions are made up of two parts: the light dependent reactions and the carbon fixation reactions. In the light dependent reactions, chlorophyll and other photosynthetic pigments absorb light energy from the sun and conserve it as ATP and NADPH with a simultaneous release of oxygen. The carbon fixation reactions are driven by the products of the light dependent reactions.
 
        
             
        
        
        
They also reproduce asexually through budding, bulb formation, and other types<span> of vegetative reproduction. Even though ... Approximately 1,700 species of </span>plants live<span> on the Arctic tundra, including flowering </span>plants<span>, dwarf shrubs, herbs, grasses, mosses, and lichens. ... Its </span>name<span> comes from its resemblance of tiny antlers.</span>
        
                    
             
        
        
        
Answer:
The statements in options A,B,C,D and E are all correct.
A. Invertebrates lack a back bone
B. Ecdysozoans typically posses a flexible exoskeleton that protects these animals from harmful external factors like water loss.
C. Deuterstomia, Lophotrochozoa and Ecdysozoa are classes of Bilaterians.
D. Animal A is a bilateral because bilateral embryos are triploblastic possessing three germ layers, are bilaterally symmetrical and lack a back bone. 
E. All animal from studies are found to have a common ancestry.