Which of the following statements about the stimulation of muscle cells is true? a. neurotransmitters are released into the synapse between two muscle cells. b. calcium ions bind the actin-myosin complex to start the muscle contraction process. c. acetylcholine opens channels that allow calcium ions into the muscle cell. d. an action potential in a muscle cell ultimately results in the release of calcium ions into the cell.

Asap timed! 1. ice core samples from glaciers ice caps contain bubbles of ancient atmosphere that are in layers based on age. what questions are scientists most interested in? a. how the amount of water vapor needed to make the ice has changed b. how the amount of ozone has changed over time.c. how the amount of ice in each layer has changed over time d. how the amount of carbon dioxide has changed over time 2. what produces milankovich cycles ? a. sunspots ams solar flare on the suns surface b. changes in the earths orbit c. gravitational changes bases on the position of the sun and the moond. cycles of vegetation that result in desert and rainforest conditions

The first three phases of the cell cycle are collectively known as (1 point) play audio cellular respiration. telophase. mitosis. interphase.

Me the formula cacl2 represents the compound