PLEASE HELP ASAP!! PLEASE

CO2 levels are high in the first half of the year, low in the second half(but increasing on average over time)

SEE BELOW for the rest

Explanation:

concepts

photosynthesis uses light, CO2 and H2O to produce glucose and O2

Respiration uses glucose and O2 to produce CO2 and H2O and energy

Reasoning

this is northern hemisphere data. Winter and colder weather, and winter-deciduous trees reduce removal of CO2 from the atmosphere. The second half of the year is influenced by summer, with high growth rates and high CO2 uptake, reducing atmospheric levels

the element that provides strength to the exoskeletons of clams and oysters is phosphorus. this is so because calcium carbonate is the main component in the shells.

explanation:

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