Answer:
The heart is a muscular organ about the size of a fist, located just behind and slightly left of the breastbone. The heart pumps blood through the network of arteries and veins called the cardiovascular system.
Answer:
Breeding ground
Explanation:
high levels of oxygen provide necessary material and aquatic insects provide a food source for the new hatchlings.
Non disjunction is the answer.
Synapsid is the chromosome coming close to each other to cross over.
Crossing over is the process of interchanging parts at a particular allele (loci)
Tetrad is a formation of chromosomes (looks like this “XX”)
The ends of the actin filaments are anchored to the Z-line or disk.
The sarcomere is the primary functional unit of muscle fiber. It is flanked by a Z-band on each end with adjoining I-bands. The Z-band or disk is a dense fibrous structure composed of actin, α-actinin as well as other proteins.
Thin filaments or actin filaments are anchored at one end at the Z-band. Titin is connected to both the Z-band and the M-line. Thick filaments are attached in the middle of the sarcomere at the M-line.
An intermediary filament protein forms a meshwork from one Z-disk to the next across the myofibril. These networks are joined by actin through the protein dystrophin to the sarcolemma.
To learn more about sarcomere here
brainly.com/question/14005497
#SPJ4