The deepest parts of the ocean are hostile to life. a barren stretch of sea floor recently experienced an earthquake that opened up a hydrothermal vent. this vent provides heat and nutrients. over time, the area became filled with various deep-sea life forms. what kind of ecological activity is this? this is a form of

the correct option is option d

answer/// the nucleoid region contains dna; ///

the answer is: the „power stroke“ step.

muscle contraction can be divided into a few steps:

1. the release of ach (acetylcholine) in the synaptic cleft, binding of ach for its receptor and consequently opening of the ca channels.

2. the release of ca, binding of ca for the troponin

3. troponin shifting the tropomyosin, which was blocking the active site on the actin

4. myosin heads attaching to actin by breaking down atp to adp+ pi

5.   formation of the ‘cross-bridge’ on the active site of the actin filament by myosin head

6. “power stroke” -the cross bridge pulls actin, which slides over the myosin

9.     7. the release of adp completes the cross-bridge movement and atp attaches to myosin, breaking the actin-myosin cross bridge.

answer///(c) the maximum number of organisms an environment can support for a long time; i believe this is correct, plz check luck;