Blood received into the heart from the systemic circuit is

1- high in oxygen and low in carbon dioxide.

2- low in oxygen and low in carbon dioxide.

3- high in oxygen and high in carbon dioxide.

4- low in oxygen and high in carbon dioxide.

its either number 1 or number 3 because oxygenated blood goes to the heart

humans are now responsible for causing changes in the environment that hurt animals and plant species. we take up more space on earth for our homes and cities. we pollute habitats. human activity often changes or destroys the habitats that plants and animals need to survive.