The phrase "activities decline" is correct and usable in written English.
It can be used to describe a decrease or reduction in the number or level of activities taking place in a certain context.
Example: "Due to the recent economic downturn, we have noticed a significant activities decline in our community programs."
Alternatives: "decrease in activities" or "reduction in activities".
Both enzymes are most active during acidogenesis and their specific activities decline during solventogenesis, two-fold for PTB and six-fold for Buk [ 76, 77].
Student activities decline as courses advance, and many students abandon courses prematurely.
Although the skin possesses extremely efficient anti-oxidant activities, during ageing, ROS levels rise and anti-oxidant activities decline.
Chondrocyte mitotic and synthetic activities decline with age, as well as age related responses to anabolic cytokines [ 110, 112].
This is surprising since levels of oxidized (typically aggregated and cross-linked) proteins usually increase with age, as Proteasome [ 3- 5] and Lon protease [ 6, 7] activities decline.
These activities decline with aging and contribute to the development of several age-related pathologies such as Alzheimer's disease, Parkinson's disease, cataracts, and vascular disease (Koga et al., 2011).
The operating profit, which focuses on regular business activities, declined from 592 million euros a year ago ($521 million).
After Mr. Arafat's efforts, violent activities declined throughout most of the West Bank and Gaza.
At the end of the 19th century and the 20th century, agropastoral activities declined while reforestation was carried out.
It was seen that SCR activities declined dramatically after 12 h aging, and XRD results showed this treatment led to crystallinity decline since 3 h.
But slowly, over time, their ability to do these and other activities declined substantially.
