Insects and crustaceans studied in the lab this week share what two characteristics? 1. exoskeleton of chitin and are in the clade ecdysoza. 2. exoskeleton of chitin and are in the clade lophotrochozoa 3. exoskeleton of chitin and both have three pairs of biramous appendages 4. exoskeleton of chitin and both are found in terrestrial habitat

The observations of hooke and van leeuwenhoek documenting the existence of microscopic cells formed the basis of what important theory? a. the cell theory stating that all living things are composed of cellsb. the theory of spontaneous generation, which held that life forms could arise spontaneouslyc. the theory of chemotherapy, or use of antimicrobials to destroy pathogenic organismsd. the germ theory of disease and causative agents

What is the next step in muscle contraction after the actin changes shape? (apex)

Most animal cell membranes have proteins that pump. ions out of the cell and potassium ions into this