The double layered sac surrounding the heart is the pericardium
Answer:
D
Explanation:
From the name nucleus it is meant to be nuclear energy
Answer:
Testing positive for HIV means a high chance of death and a good chance of lower reproduction rates. But some people are immune to HIV, which makes them more evolutionarily fit, likely to live longer, likely to reproduce more, which would increase the frequency of the immune allele in the population. Over time, this increase in frequency of the gene that causes immunity could spread across the human race and cause it to evolve.
Answer:
Yes, if the mother swan pushes a third baby swan in front of her, work being done on the third baby.
Explanation:
Work is defined as the displacement covers by the body in the direction of the applied force. Work will be done on the body if a person pulls or pushes the other body or object. So according to the definition of work, if the mother swan pushes the third baby and the baby covers some distance away from the mother swan so we can say that work being done on the third baby.
A plant is probably a dicot if it has an embryo that bears seed leaves.
I hope this helps! :)