Blood enter the right atrium of the heart via the vena cava (superior and inferior)
The right atrium contracts to push the blood into the right ventricle through the triscupid valve
The contraction of the right ventricle pushes the blood through the pulmonary valve to the pulmonary artery which carries it to the lungs to be oxygenated
After oxygenation, the pulmonary vein brings blood to the left atrium
Contraction of the left atrium pushes the blood through the mitral valve into the left ventricle
The left ventricle contracts to push the blood through the aortic valve, into the aorta, which carries the blood through the body.
Answer: Most of the steps of cellular respiration take place in the mitochondria. Oxygen and glucose are both reactants in the process of cellular respiration. The main product of cellular respiration is ATP; waste products include carbon dioxide and water.
Explanation: no
The answer is B because the graph shows a linear relationship between amount of ice cream eaten and temperature.
The correct answer is: d. Lethal dominant alleles are harmful whether they are carried in homozygous or heterozygous form, so there is always strong selection against these alleles.
Lethal alleles cause the death (prenatal or after birth, but usually early in development) of the organism that carries them. There are three types of lethal alleles:
• Recessive-both alleles must be defective,
• Dominant-it is sufficient that one allele is lethal to cause the death,
• Conditional depending on the gene or genes involved.
Lethal alleles are usually a result of mutations in genes essential for development of an organism.
