The correct answer is 2. ligers cannot reproduce.
When lions and tigers reproduce, their offspring is called a liger, as a combination of a lion and a tiger. However, this offspring is infertile, meaning that it cannot produce children of its own, it cannot reproduce any further. This is why they can only be found in zoos, and not in the wild.
The dominant carbohydrate in human milk is lactose.
The oxpeckers are two species of bird which make up the family Buphagidae. Some ornithologists regard them as a subfamily Buphaginae within the starling family, Sturnidae, but they appear to be quite distinct.Oxpeckers are endemic to the savanna of Sub-Saharan Africa. Both the English and scientific names arise from their habit of perching on large mammals (both wild and domesticated) such as cattle, zebras, impalas, hippopotamuses, or rhinoceroses, and eating ticks, small insects, botfly larvae, and other parasites.
According to the more recent studies of Muscicapoidea phylogeny the oxpeckers are an ancient line related to Mimidae (mockingbirds and thrashers) and starlings but not particularly close to either. Considering the known biogeography of these groups, the most plausible explanation seems that the oxpecker lineage originated in Eastern or Southeastern Asia like the other two.This would make the two species of Buphagus something like living fossils, and demonstrates that such remnants of past evolution can possess striking and unique autapomorphic adaptations.
A because none of the others could be correct if you think about them
<h2>Action potential </h2>
Explanation:
Brief sequential change in the membrane potential of excitable cells after stimulus is called action potential
Phases of action potential includes:
- Depolarization: Starts when a threshold stimulus applied on a neuron via Na+ mechanically operated channels that trigger action potential
- Depolarization of membrane potential is due to influx of Na+ via voltage gated Na+ channels
- Fast opening of voltage gated Na+ channels shift membrane potential from -70mV to +50mV at which voltage gated Na+ channels becomes inactive, thus influx of Na+ abruptly stops
- Repolarization: Starts with the efflux of K+ by the opening of voltage gated K+ channels
- Voltage gated K+ channels starts to open when voltage gated Na+ channels becomes inactive
- Hyperpolarization: Occurs due to excessive efflux of K+ by voltage gated K+ channels
- Additional efflux of K+ occurs due to slow inactivation of voltage gated K+ channels
- In a typical neuron cell, membrane potential of cytoplasm is negative (-70mV) at rest hence called resting membrane potential
- Resting membrane potential of excitable cells is established by Na+ K+ pump and maintained by K+ leaky channels at rest
