A covalent bond is a chemical bond that occurs when two or more atoms share electrons. The sharing of electrons helps complete the outer shell, or valence shell, of both atoms. The sharing of electrons creates a stable balance of attractive and repulsive forces between atoms.

TLS Online TPP Program

#Id: 5493

#XL - T Zoology

If survival of juveniles and adult is poor - Selection favors a single act of reproduction

TLS Online TPP Program

#Id: 5494

#XL - T Zoology

If survival of juveniles is very poor and unpredictable but adult are more likely to survive - Selection favors repeated reproduction and long reproductive life.

TLS Online TPP Program

#Id: 5495

#XL - T Zoology

Under favorable circumstances, the same per unit biomass of annuals produces more seeds than the same per unit biomass of trees. 

TLS Online TPP Program

#Id: 5496

#XL - T Zoology

k-selected species

Stable populations adapted to exist at or near the carrying capacity, K

Grow slowly and reach reproductive age late, having to devote much energy to growth and maintenance

K-selected species like a tree grows large and outcompeting  other  species

Such trees have a long-life span and produce seeds repeatedly when mature

These seeds are bigger

Nonrandom matting

TLS Online TPP Program

#Id: 5497

#XL - T Zoology

TLS Online TPP Program

#Id: 5498

#XL - T Zoology